document.write( "Question 1076491: If f(g(x)) = 4x^2 - 8x and f(x) = x^2 - 4 , then g(x) = ? \n" ); document.write( "

Algebra.Com's Answer #691098 by MathLover1(20850) $\"\"$ $\"About$

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If $\"f%28g%28x%29%29+=+4x%5E2-8x\"$ and $\"f%28x%29+=+x%5E2+-4\"$ , then $\"g%28x%29\"$ = ? \r
\n" ); document.write( "\n" ); document.write( "to find $\"g%28x%29\"$ ;\r
\n" ); document.write( "\n" ); document.write( " $\"f%28g%28x%29%29+=+4x%5E2-8x\"$ ,\r
\n" ); document.write( "\n" ); document.write( "from $\"f%28x%29\"$ ;\r
\n" ); document.write( "\n" ); document.write( " $\"%28g%28x%29%29%5E2+-4+=+4x%5E2+-8x\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"%28g%28x%29%29%5E2+=+4x%5E2+-8x%2B4\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"%28g%28x%29%29%5E2+=+4%28x%5E2+-2x%2B1%29\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"%28g%28x%29%29%5E2+=+4%28x-1%29%5E2\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"g%28x%29+=+highlight%282%28x-1%29%29\"$ or $\"g%28x%29+=+highlight%28-2%28x-1%29%29\"$ \r
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\n" ); document.write( "\n" ); document.write( "check: if $\"f%28x%29+=+x%5E2+-+4\"$ and $\"g%28x%29+=+2%28x-1%29\"$ \r
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\n" ); document.write( "or\r
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\n" ); document.write( " \n" ); document.write( "

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