document.write( "Question 153089: Solve for x\r
\n" ); document.write( "\n" ); document.write( "x^2+72=12x \n" ); document.write( "

Algebra.Com's Answer #112571 by Earlsdon(6294) $\"\"$ $\"About$

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Solve for x:
\n" ); document.write( " $\"x%5E2%2B72+=+12x\"$ First, subtract 12x from both sides.
\n" ); document.write( " $\"x%5E2-12x%2B72+=+0\"$ The trinomial is not factorable, so use the quadratic formula: $\"x+=+%28-b%2B-sqrt%28b%5E-4ac%29%29%2F2a\"$ , where a = 1, b = -12, and c = 72.
\n" ); document.write( " $\"x+=+%28-%28-12%29%2B-sqrt%28%28-12%29%5E2-4%281%29%2872%29%29%29%2F2%281%29\"$
\n" ); document.write( " $\"x+=+%2812%2B-sqrt%28144-288%29%29%2F2\"$
\n" ); document.write( " $\"x+=+%2812%2B-sqrt%28-144%29%29%2F2\"$
\n" ); document.write( " $\"x+=+%2812%2B-12sqrt%28-1%29%29%2F2\"$
\n" ); document.write( " $\"x+=+6%2B6i\"$ or $\"x+=+6-6i\"$
\n" ); document.write( " \n" ); document.write( "

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