document.write( "Question 856123: how do i solve for f(x)=81-x^2 \n" ); document.write( "

Algebra.Com's Answer #515757 by Theo(13342) $\"\"$ $\"About$

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set f(x) = 0 and factor it as follows:
\n" ); document.write( "start with:
\n" ); document.write( "81 - x^2 = 0
\n" ); document.write( "add x^2 to both sides of the equation to get:
\n" ); document.write( "81 = x^2
\n" ); document.write( "take the square root of both sides to get:
\n" ); document.write( "x = +/- sqrt(81) which results in:
\n" ); document.write( "x = +/- 9
\n" ); document.write( "9^2 = 81
\n" ); document.write( "(-9)^2 = 81\r
\n" ); document.write( "
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