document.write( "Question 800925: Solve the equation by completing the square: Solve the equation by completing the square: 4x^2-4x-9=0 \n" ); document.write( "
Algebra.Com's Answer #483405 by rothauserc(4718)\"\" \"About 
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4x^2-4x-9=0
\n" ); document.write( "rewrite equation
\n" ); document.write( "4x^2-4x = 9
\n" ); document.write( "divide both sides of = by 4
\n" ); document.write( "x^2 -x = 9/4
\n" ); document.write( "divide coefficient of x by 2, equals 1/2 and 1/2 squared = 1/4
\n" ); document.write( "x^2 -x +1/4 = 9/4 + 1/4
\n" ); document.write( "factor equation
\n" ); document.write( "(x-1/2)^ = 10/4
\n" ); document.write( "take square of both sides of =
\n" ); document.write( "(x -1/2) = + or - square root (10/4) = (+ or - square root(10)) / 2
\n" ); document.write( "x = 1/2 (+ or - square root(10)) / 2
\n" ); document.write( "x = 1/2 + (square root (10)) / 2
\n" ); document.write( "x = 1/2 - (square root (10)) / 2\r
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