document.write( "Question 192184: Hello,\r
\n" ); document.write( "\n" ); document.write( "I just want to doublecheck my answers if someone can help me.\r
\n" ); document.write( "\n" ); document.write( "Solve the following for x (use quadratic equation or factor out):
\n" ); document.write( "4x^3-8x^2=0
\n" ); document.write( "My answer was that there are No solutions to this problem\r
\n" ); document.write( "\n" ); document.write( "The other problem was:
\n" ); document.write( "5x^2-3x+6=0
\n" ); document.write( "My answer was the following:
\n" ); document.write( "using the quadratic equation I came out with
\n" ); document.write( "3-+SQRT(-3)^2-4(5)(6)/2(5)
\n" ); document.write( "= 3-+SQRT111/10\r
\n" ); document.write( "\n" ); document.write( "Since the SQRT of 111 is 10.525 it would not be a R number, thereby No solution either.\r
\n" ); document.write( "\n" ); document.write( "Please let me know if I have that right; it would be greatly appreciated.
\n" ); document.write( "Thank you,
\n" ); document.write( "Gryhd
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Algebra.Com's Answer #144220 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( "\"4x%5E3-8x%5E2=0\" Start with the given equation\r
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\n" ); document.write( "\n" ); document.write( "\"4x%5E2%28x-2%29=0\" Factor out the GCF \"4x%5E2\"\r
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\n" ); document.write( "\n" ); document.write( "\"4x%5E2=0\" or \"x-2=0\" Set each factor equal to zero\r
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\n" ); document.write( "\n" ); document.write( "\"x=0\" or \"x=2\" Solve for \"x\" in each case\r
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\n" ); document.write( "\n" ); document.write( "So the solutions are \"x=0\" or \"x=2\"\r
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\n" ); document.write( "\n" ); document.write( "# 2\r
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\n" ); document.write( "\n" ); document.write( "\"5x%5E2-3x%2B6=0\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "Notice we have a quadratic equation in the form of \"ax%5E2%2Bbx%2Bc\" where \"a=5\", \"b=-3\", and \"c=6\"\r
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\n" ); document.write( "\n" ); document.write( "Let's use the quadratic formula to solve for x\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-b+%2B-+sqrt%28+b%5E2-4ac+%29%29%2F%282a%29\" Start with the quadratic formula\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-%28-3%29+%2B-+sqrt%28+%28-3%29%5E2-4%285%29%286%29+%29%29%2F%282%285%29%29\" Plug in \"a=5\", \"b=-3\", and \"c=6\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%283+%2B-+sqrt%28+%28-3%29%5E2-4%285%29%286%29+%29%29%2F%282%285%29%29\" Negate \"-3\" to get \"3\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%283+%2B-+sqrt%28+9-4%285%29%286%29+%29%29%2F%282%285%29%29\" Square \"-3\" to get \"9\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%283+%2B-+sqrt%28+9-120+%29%29%2F%282%285%29%29\" Multiply \"4%285%29%286%29\" to get \"120\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%283+%2B-+sqrt%28+-111+%29%29%2F%282%285%29%29\" Subtract \"120\" from \"9\" to get \"-111\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%283+%2B-+sqrt%28+-111+%29%29%2F%2810%29\" Multiply \"2\" and \"5\" to get \"10\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%283+%2B-+i%2Asqrt%28111%29%29%2F%2810%29\" Simplify the square root. Note: if you have no clue what the term \"i\" is (ie you haven't learned about it yet), then this means that the answer is simply \"no solutions\"\r
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\n" ); document.write( "\n" ); document.write( "If you know what \"i\" is, then...\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%283%2Bi%2Asqrt%28111%29%29%2F%2810%29\" or \"x+=+%283-i%2Asqrt%28111%29%29%2F%2810%29\" Break up the expression. \r
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\n" ); document.write( "\n" ); document.write( "So the answers are \"x+=+%283%2Bi%2Asqrt%28111%29%29%2F%2810%29\" or \"x+=+%283-i%2Asqrt%28111%29%29%2F%2810%29\" \r
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\n" ); document.write( "\n" ); document.write( "which approximate to \"x=1.354%2Ai\" or \"x=-0.754%2Ai\" \r
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\n" ); document.write( "\n" ); document.write( "Note: Once again, if you have no clue what the term \"i\" is (ie you haven't learned about it yet), then this means that the answer is simply \"no solutions\"
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