document.write( "Question 621485: complete the square x^2+12x=9 \n" ); document.write( "
Algebra.Com's Answer #390769 by nerdybill(7384)\"\" \"About 
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complete the square
\n" ); document.write( "x^2+12x=9
\n" ); document.write( "take half 'b', square it and add to both sides:
\n" ); document.write( "x^2+12x+36 = 9+36
\n" ); document.write( "x^2+12x+36 = 45
\n" ); document.write( "(x+6)(x+6) = 45
\n" ); document.write( "(x+6)^2 = 45
\n" ); document.write( "x+6 = sqrt(45)
\n" ); document.write( "x+6 = +-sqrt(3*3*5)
\n" ); document.write( "x+6 = +-3sqrt(5)
\n" ); document.write( "x = -6+-3sqrt(5)\r
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