document.write( "Question 150910: Hello all I would like your help one more time. I've got most of what my teacher asked us to do but I am stuck on the following the task is to:\r
\n" ); document.write( "\n" ); document.write( "Evaluate the functions for the values of x given as 1, 2, 4, 8, and 16. Describe the differences in the rate at which each function changes with increasing values of x. f(x) = x2 - 3x + 2
\n" ); document.write( "f(x) = 2x3 + 7x2 - x - 1
\n" ); document.write( "f(x) = 10x
\n" ); document.write( "f(x) = ln x (I don't know if this is (one n x) or the letter (l)n x, whatever that means)\r
\n" ); document.write( "\n" ); document.write( "Any help would be GREATLY appreciated!!
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Algebra.Com's Answer #110846 by jim_thompson5910(35256)\"\" \"About 
You can put this solution on YOUR website!
# 1\r
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\n" ); document.write( "\n" ); document.write( "Let's find the function value when \"x=1\":\r
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\n" ); document.write( "\n" ); document.write( "\"y=x%5E2-3x%2B2\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "\"y=%281%29%5E2-3%281%29%2B2\" Plug in \"x=1\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=1%281%29-3%281%29%2B2\" Square \"1\" to get \"1\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=1-3%281%29%2B2\" Multiply \"1\" and \"1\" to get \"1\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=1-3%2B2\" Multiply \"-3\" and \"1\" to get \"-3\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=0\" Combine like terms.\r
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\n" ); document.write( "\n" ); document.write( "So if \"x=1\", then \"y=0\".\r
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\n" ); document.write( "\n" ); document.write( "Let's find the function value when \"x=2\":\r
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\n" ); document.write( "\n" ); document.write( "\"y=x%5E2-3x%2B2\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "\"y=%282%29%5E2-3%282%29%2B2\" Plug in \"x=2\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=1%284%29-3%282%29%2B2\" Square \"2\" to get \"4\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=4-3%282%29%2B2\" Multiply \"1\" and \"4\" to get \"4\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=4-6%2B2\" Multiply \"-3\" and \"2\" to get \"-6\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=0\" Combine like terms.\r
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\n" ); document.write( "\n" ); document.write( "So if \"x=2\", then \"y=0\".\r
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\n" ); document.write( "\n" ); document.write( "-------------\r
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\n" ); document.write( "\n" ); document.write( "Let's find the function value when \"x=4\":\r
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\n" ); document.write( "\n" ); document.write( "\"y=x%5E2-3x%2B2\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "\"y=%284%29%5E2-3%284%29%2B2\" Plug in \"x=4\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=1%2816%29-3%284%29%2B2\" Square \"4\" to get \"16\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=16-3%284%29%2B2\" Multiply \"1\" and \"16\" to get \"16\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=16-12%2B2\" Multiply \"-3\" and \"4\" to get \"-12\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=6\" Combine like terms.\r
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\n" ); document.write( "\n" ); document.write( "So if \"x=4\", then \"y=6\".\r
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\n" ); document.write( "\n" ); document.write( "Let's find the function value when \"x=8\":\r
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\n" ); document.write( "\n" ); document.write( "\"y=x%5E2-3x%2B2\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "\"y=%288%29%5E2-3%288%29%2B2\" Plug in \"x=8\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=1%2864%29-3%288%29%2B2\" Square \"8\" to get \"64\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=64-3%288%29%2B2\" Multiply \"1\" and \"64\" to get \"64\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=64-24%2B2\" Multiply \"-3\" and \"8\" to get \"-24\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=42\" Combine like terms.\r
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\n" ); document.write( "\n" ); document.write( "So if \"x=8\", then \"y=42\".\r
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\n" ); document.write( "\n" ); document.write( "Let's find the function value when \"x=16\":\r
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\n" ); document.write( "\n" ); document.write( "\"y=x%5E2-3x%2B2\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "\"y=%2816%29%5E2-3%2816%29%2B2\" Plug in \"x=16\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=1%28256%29-3%2816%29%2B2\" Square \"16\" to get \"256\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=256-3%2816%29%2B2\" Multiply \"1\" and \"256\" to get \"256\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=256-48%2B2\" Multiply \"-3\" and \"16\" to get \"-48\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=210\" Combine like terms.\r
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\n" ); document.write( "\n" ); document.write( "So if \"x=16\", then \"y=210\".\r
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\n" ); document.write( "\n" ); document.write( "Now let's make a table of the values we just found.\r
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Jump to Top of Page\r
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Table of Values:

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xy
10
20
46
842
16210
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\n" ); document.write( "\n" ); document.write( "Let's find the function value when \"x=1\":\r
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\n" ); document.write( "\n" ); document.write( "\"y=2x%5E3%2B7x%5E2-x-1\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "\"y=2%281%29%5E3%2B7%281%29%5E2-1-1\" Plug in \"x=1\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=2%281%29%2B7%281%29%5E2-1-1\" Cube \"1\" to get \"1\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=2%281%29%2B7%281%29-1-1\" Square \"1\" to get \"1\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=2%2B7%281%29-1-1\" Multiply \"2\" and \"1\" to get \"2\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=2%2B7-1-1\" Multiply \"7\" and \"1\" to get \"7\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=7\" Combine like terms.\r
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\n" ); document.write( "\n" ); document.write( "So if \"x=1\", then \"y=7\".\r
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\n" ); document.write( "\n" ); document.write( "Let's find the function value when \"x=2\":\r
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\n" ); document.write( "\n" ); document.write( "\"y=2x%5E3%2B7x%5E2-x-1\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "\"y=2%282%29%5E3%2B7%282%29%5E2-2-1\" Plug in \"x=2\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=2%288%29%2B7%282%29%5E2-2-1\" Cube \"2\" to get \"8\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=2%288%29%2B7%284%29-2-1\" Square \"2\" to get \"4\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=16%2B7%284%29-2-1\" Multiply \"2\" and \"8\" to get \"16\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=16%2B28-2-1\" Multiply \"7\" and \"4\" to get \"28\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=41\" Combine like terms.\r
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\n" ); document.write( "\n" ); document.write( "So if \"x=2\", then \"y=41\".\r
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\n" ); document.write( "\n" ); document.write( "Let's find the function value when \"x=4\":\r
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\n" ); document.write( "\n" ); document.write( "\"y=2x%5E3%2B7x%5E2-x-1\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "\"y=2%284%29%5E3%2B7%284%29%5E2-4-1\" Plug in \"x=4\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=2%2864%29%2B7%284%29%5E2-4-1\" Cube \"4\" to get \"64\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=2%2864%29%2B7%2816%29-4-1\" Square \"4\" to get \"16\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=128%2B7%2816%29-4-1\" Multiply \"2\" and \"64\" to get \"128\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=128%2B112-4-1\" Multiply \"7\" and \"16\" to get \"112\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=235\" Combine like terms.\r
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\n" ); document.write( "\n" ); document.write( "So if \"x=4\", then \"y=235\".\r
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\n" ); document.write( "\n" ); document.write( "Let's find the function value when \"x=8\":\r
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\n" ); document.write( "\n" ); document.write( "\"y=2x%5E3%2B7x%5E2-x-1\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "\"y=2%288%29%5E3%2B7%288%29%5E2-8-1\" Plug in \"x=8\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=2%28512%29%2B7%288%29%5E2-8-1\" Cube \"8\" to get \"512\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=2%28512%29%2B7%2864%29-8-1\" Square \"8\" to get \"64\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=1024%2B7%2864%29-8-1\" Multiply \"2\" and \"512\" to get \"1024\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=1024%2B448-8-1\" Multiply \"7\" and \"64\" to get \"448\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=1463\" Combine like terms.\r
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\n" ); document.write( "\n" ); document.write( "So if \"x=8\", then \"y=1463\".\r
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\n" ); document.write( "\n" ); document.write( "Let's find the function value when \"x=16\":\r
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\n" ); document.write( "\n" ); document.write( "\"y=2x%5E3%2B7x%5E2-x-1\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "\"y=2%2816%29%5E3%2B7%2816%29%5E2-16-1\" Plug in \"x=16\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=2%284096%29%2B7%2816%29%5E2-16-1\" Cube \"16\" to get \"4096\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=2%284096%29%2B7%28256%29-16-1\" Square \"16\" to get \"256\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=8192%2B7%28256%29-16-1\" Multiply \"2\" and \"4096\" to get \"8192\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=8192%2B1792-16-1\" Multiply \"7\" and \"256\" to get \"1792\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=9967\" Combine like terms.\r
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\n" ); document.write( "\n" ); document.write( "So if \"x=16\", then \"y=9967\".\r
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\n" ); document.write( "\n" ); document.write( "Now let's make a table of the values we just found.\r
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Table of Values:

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xy
17
241
4235
81463
169967
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\n" ); document.write( "\n" ); document.write( "# 3\r
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\n" ); document.write( "\n" ); document.write( "Let's find the function value when \"x=1\":\r
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\n" ); document.write( "\n" ); document.write( "\"y=10x\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "\"y=10%281%29\" Plug in \"x=1\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=10\" Multiply \"10\" and \"1\" to get \"10\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=10\" Combine like terms.\r
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\n" ); document.write( "\n" ); document.write( "So if \"x=1\", then \"y=10\".\r
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\n" ); document.write( "\n" ); document.write( "Let's find the function value when \"x=2\":\r
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\n" ); document.write( "\n" ); document.write( "\"y=10x\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "\"y=10%282%29\" Plug in \"x=2\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=20\" Multiply \"10\" and \"2\" to get \"20\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=20\" Combine like terms.\r
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\n" ); document.write( "\n" ); document.write( "So if \"x=2\", then \"y=20\".\r
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\n" ); document.write( "\n" ); document.write( "Let's find the function value when \"x=4\":\r
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\n" ); document.write( "\n" ); document.write( "\"y=10x\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "\"y=10%284%29\" Plug in \"x=4\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=40\" Multiply \"10\" and \"4\" to get \"40\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=40\" Combine like terms.\r
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\n" ); document.write( "\n" ); document.write( "So if \"x=4\", then \"y=40\".\r
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\n" ); document.write( "\n" ); document.write( "-------------\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Let's find the function value when \"x=8\":\r
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\n" ); document.write( "\n" ); document.write( "\"y=10x\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "\"y=10%288%29\" Plug in \"x=8\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=80\" Multiply \"10\" and \"8\" to get \"80\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=80\" Combine like terms.\r
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\n" ); document.write( "\n" ); document.write( "So if \"x=8\", then \"y=80\".\r
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\n" ); document.write( "\n" ); document.write( "-------------\r
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\n" ); document.write( "\n" ); document.write( "Let's find the function value when \"x=16\":\r
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\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"y=10x\" Start with the given equation.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"y=10%2816%29\" Plug in \"x=16\".\r
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\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"y=160\" Multiply \"10\" and \"16\" to get \"160\".\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"y=160\" Combine like terms.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "So if \"x=16\", then \"y=160\".\r
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\n" ); document.write( "\n" ); document.write( "-------------\r
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\n" ); document.write( "\n" ); document.write( "Now let's make a table of the values we just found.\r
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Table of Values:

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xy
110
220
440
880
16160
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\r
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\r
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\n" ); document.write( "\n" ); document.write( "# 4\r
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\n" ); document.write( "\n" ); document.write( "Note: ln(x) also looks like LN(x) (to pronounce it, simply read off the letters \"L\" \"N\")\r
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\n" ); document.write( "\n" ); document.write( "This is the natural log of x. So it is a logarithmic function.\r
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\n" ); document.write( "\n" ); document.write( "Let's find the y value when \"x=1\" \r
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\n" ); document.write( "\n" ); document.write( "\"y=ln%28x%29\" Start with the given equation.\r
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\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"y=ln%281%29\" Plug in \"x=1\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=0\" Take the natural log of 1 to get 0\r
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\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "So when \"x=1\", \"y=0\". \r
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\n" ); document.write( "\n" ); document.write( "----------------------------\r
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\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Let's find the y value when \"x=2\" \r
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\n" ); document.write( "\n" ); document.write( "\"y=ln%28x%29\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "\"y=ln%282%29\" Plug in \"x=2\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=0.693\" Take the natural log of 2 to get 0.693\r
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\n" ); document.write( "\n" ); document.write( "So when \"x=2\", \"y=0.693\".\r
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\n" ); document.write( "\n" ); document.write( "----------------------------\r
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\n" ); document.write( "\n" ); document.write( "Let's find the y value when \"x=4\" \r
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\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"y=ln%28x%29\" Start with the given equation.\r
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\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"y=ln%284%29\" Plug in \"x=4\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=1.386\" Take the natural log of 4 to get 1.386\r
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\n" ); document.write( "\n" ); document.write( "So when \"x=4\", \"y=1.386\". \r
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\n" ); document.write( "\n" ); document.write( "-------------------------------\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Let's find the y value when \"x=8\" \r
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\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"y=ln%28x%29\" Start with the given equation.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"y=ln%288%29\" Plug in \"x=8\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=2.079\" Take the natural log of 8 to get 2.079\r
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\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "So when \"x=8\", \"y=2.079\". \r
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\n" ); document.write( "\n" ); document.write( "-------------------------------------\r
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\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Let's find the y value when \"x=16\" \r
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\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"y=ln%28x%29\" Start with the given equation.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"y=ln%2816%29\" Plug in \"x=16\".\r
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\n" ); document.write( "\n" ); document.write( "\"y=2.773\" Take the natural log of 16 to get 2.773\r
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\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "So when \"x=16\", \"y=2.773\".\r
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\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Now let's make a table of the values we just found.\r
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\n" ); document.write( "\n" ); document.write( "

Table of Values:

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xy
10
20.693
41.386
82.079
162.773
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\r
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\n" ); document.write( "\n" ); document.write( "===========================================================\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "So to compare the rates, simply compare the tables:\r
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\n" ); document.write( "\n" ); document.write( "Table for \"y=x%5E2-3x%2B2\"\r
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xy
10
20
46
842
16210
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\r
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\n" ); document.write( "\n" ); document.write( "Table for \"y=2x%5E3%2B7x%5E2-x-1\"\r
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xy
17
241
4235
81463
169967
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\r
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\n" ); document.write( "\n" ); document.write( "Table for \"y=10x\"\r
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xy
110
220
440
880
16160
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\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Table for \"y=ln%28x%29\"\r
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xy
10
20.693
41.386
82.079
162.773
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\r
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\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "From the tables, the functions can be sorted from slowest growing to fastest growing like this:\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"y=ln%28x%29\", \"y=10x\", \"y=x%5E2-3x%2B2\", and \"y=2x%5E3%2B7x%5E2-x-1\"\r
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\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "So \"y=ln%28x%29\" is the slowest growing function and \"y=2x%5E3%2B7x%5E2-x-1\" is the fastest growing function.\r
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\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "If all of that is confusing, simply graph all of the functions to get\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " Graph of \"y=x%5E2-3x%2B2\" (red), \"y=2x%5E3%2B7x%5E2-x-1\" (green), \"y=10x\"(blue), and \"y=ln%28x%29\" (purple)\r
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\n" ); document.write( "\n" ); document.write( "From the graph, we can see that the order from slowest growing to fastest growing is\r
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\n" ); document.write( "\n" ); document.write( "\"y=ln%28x%29\", \"y=10x\", \"y=x%5E2-3x%2B2\", and \"y=2x%5E3%2B7x%5E2-x-1\"
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