document.write( "Question 563073: Find the roots of the equation 40x-80=5x^2 by Factoring.. \n" ); document.write( "

Algebra.Com's Answer #364749 by Maths68(1474) $\"\"$ $\"About$

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$\"40x-80=5x%5E2\"$
\n" ); document.write( " $\"5%288x-16%29=5x%5E2\"$
\n" ); document.write( "Divide by 5 both sides of above equation
\n" ); document.write( " $\"5%288x-16%29%2F5=5x%5E2%2F5\"$
\n" ); document.write( " $\"cross%285%29%288x-16%29%2Fcross%285%29=cross%285%29x%5E2%2Fcross%285%29\"$
\n" ); document.write( " $\"8x-16=x%5E2\"$
\n" ); document.write( " $\"x%5E2-8x%2B16=0\"$
\n" ); document.write( " $\"x%5E2-4x-4x%2B16=0\"$
\n" ); document.write( " $\"x%28x-4%29-4%28x-4%29=0\"$
\n" ); document.write( " $\"%28x-4%29%28x-4%29=0%29\"$
\n" ); document.write( " $\"%28x-4%29=0+or+%28x-4%29=0%29\"$
\n" ); document.write( " $\"x-4=0%29\"$
\n" ); document.write( " $\"x=4\"$ \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Check
\n" ); document.write( "=====
\n" ); document.write( " $\"40x-80=5x%5E2\"$
\n" ); document.write( "Put x=4
\n" ); document.write( " $\"40%284%29-80=5%284%29%5E2\"$
\n" ); document.write( " $\"160-80=5%2816%29\"$
\n" ); document.write( " $\"80=80\"$
\n" ); document.write( " \n" ); document.write( "

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