document.write( "Question 1083058: X^2+13x+39=0 \n" ); document.write( "
Algebra.Com's Answer #697075 by addingup(3677)\"\" \"About 
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x^2+13x+39 = 0
\n" ); document.write( "x^2+13x = -39
\n" ); document.write( "The coefficient of x is 13. Divide it by 2 and you get 13/2. Square it(13/2)^2 = 169/4
\n" ); document.write( "Now add it to both sides:
\n" ); document.write( "x^2+13x+169/4 = -39+169/4
\n" ); document.write( "x^2+13x+169/4 = 13/4
\n" ); document.write( "Factor the left side
\n" ); document.write( "(x+13/2)^2 = 13/4
\n" ); document.write( "sqrt(x+13/4)^2 = sqrt(13/4)
\n" ); document.write( "x+13/2 = (sqrt13)/2
\n" ); document.write( "x = [(sqrt13)-13]/2 or x = [(-sqrt13)-13]/2
\n" ); document.write( "x = -4.7 or x = -8.3\r
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