document.write( "Question 935800: Find the function f(x)=ax^3+bx^2+cx+d for which f(0)=-2, f(1)=5, f(-1)=3, f(2)=4 \n" ); document.write( "
Algebra.Com's Answer #569157 by MathLover1(20850)\"\" \"About 
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\n" ); document.write( "Find the function \"f%28x%29=ax%5E3%2Bbx%5E2%2Bcx%2Bd\" for which \"f%280%29=-2\", \"f%281%29=5\", \"f%28-1%29=3\", \"f%282%29=4\":\r
\n" ); document.write( "\n" ); document.write( "\"f%28x%29=ax%5E3%2Bbx%5E2%2Bcx%2Bd\"....we need to find coefficients\r
\n" ); document.write( "\n" ); document.write( "\"f%280%29=-2\"\r
\n" ); document.write( "\n" ); document.write( "\"f%280%29=a%2A0%5E3%2Bb%2A0%5E2%2Bc%2A0-2\"=> \"highlight%28d=-2%29\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"f%281%29=5\"\r
\n" ); document.write( "\n" ); document.write( "\"5=a%2A1%5E3%2Bb%2A1%5E2%2Bc%2A1-2\"\r
\n" ); document.write( "\n" ); document.write( "\"5%2B2=a%2Bb%2Bc\"\r
\n" ); document.write( "\n" ); document.write( "\"a%2Bb%2Bc=7\"..................eq.1\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"f%28-1%29=3\"\r
\n" ); document.write( "\n" ); document.write( "\"3=a%2A%28-1%29%5E3%2Bb%2A%28-1%29%5E2%2Bc%2A%28-1%29-2\"\r
\n" ); document.write( "\n" ); document.write( "\"3%2B2=-a%2Bb-c\"\r
\n" ); document.write( "\n" ); document.write( "\"-a%2Bb-c=5\"..................eq.2\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"f%282%29=4\"\r
\n" ); document.write( "\n" ); document.write( "\"4=a%2A2%5E3%2Bb%2A2%5E2%2Bc%2A2-2\"\r
\n" ); document.write( "\n" ); document.write( "\"4%2B2=8a%2B4b%2B2c\"\r
\n" ); document.write( "\n" ); document.write( "\"6=8a%2B4b%2B2c\"\r
\n" ); document.write( "\n" ); document.write( "\"3=4a%2B2b%2Bc\"\r
\n" ); document.write( "\n" ); document.write( "\"4a%2B2b%2Bc=3\"..................eq.3\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "use eq.1 and 2\r
\n" ); document.write( "\n" ); document.write( "\"a%2Bb%2Bc=7\"..................eq.1
\n" ); document.write( "\"-a%2Bb-c=5\"..................eq.2
\n" ); document.write( "------------------------------------add both\r
\n" ); document.write( "\n" ); document.write( "\"a%2Bb%2Bc-a%2Bb-c=7%2B5\"
\n" ); document.write( "\"2b=12\"
\n" ); document.write( "\"highlight%28b=6%29\"\r
\n" ); document.write( "\n" ); document.write( "go to \"4a%2B2b%2Bc=3\"..................eq.3 substitute \"b\" \r
\n" ); document.write( "\n" ); document.write( "\"4a%2B2%2A6%2Bc=3\"\r
\n" ); document.write( "\n" ); document.write( "\"4a%2B12%2Bc=3\"...solve for \"c\"\r
\n" ); document.write( "\n" ); document.write( "\"c=3-4a-12\"\r
\n" ); document.write( "\n" ); document.write( "\"c=-4a-9\"....->\r
\n" ); document.write( "\n" ); document.write( "go to \"a%2Bb%2Bc=7\"..................eq.1 substitute \"b\" and \"c\"\r
\n" ); document.write( "\n" ); document.write( "\"a%2B6-4a-9=7\".....solve for \"a\"\r
\n" ); document.write( "\n" ); document.write( "\"-3a-3=7\"\r
\n" ); document.write( "\n" ); document.write( "\"-3a=7%2B3\"\r
\n" ); document.write( "\n" ); document.write( "\"highlight%28a=-10%2F3%29\"\r
\n" ); document.write( "\n" ); document.write( "then \"c=-4a-9\"\r
\n" ); document.write( "\n" ); document.write( "\"c=-4%28-10%2F3%29-9\"\r
\n" ); document.write( "\n" ); document.write( "\"c=40%2F3-27%2F3\"\r
\n" ); document.write( "\n" ); document.write( "\"highlight%28c=13%2F3%29\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "the function is: \"f%28x%29=-%2810%2F3%29x%5E3%2B6x%5E2%2B%2813%2F3%29x-2\"
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