document.write( "Question 451619: solve equation by completing the square
\n" ); document.write( "x2 + 4x - 36 = 0 \n" ); document.write( "
Algebra.Com's Answer #310535 by nerdybill(7384)\"\" \"About 
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x^2 + 4x - 36 = 0
\n" ); document.write( "x^2 + 4x = 36
\n" ); document.write( "half 'b' and square it -- then add to both sides
\n" ); document.write( "x^2 + 4x + 4 = 36 + 4
\n" ); document.write( "(x+2)(x+2) = 40
\n" ); document.write( "(x+2)^2 = 40
\n" ); document.write( "x+2 = sqrt(40)
\n" ); document.write( "x+2 = sqrt(2*2*2*5)
\n" ); document.write( "x+2 = 2*sqrt(2*5)
\n" ); document.write( "x+2 = 2*sqrt(10)
\n" ); document.write( "x = 2*sqrt(10) - 2
\n" ); document.write( "x = 4.325\r
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