Solve x2 + 18x + 81 = 0

What are the factors of 81 which add up to 18?

You basically need X2 and 18X to add up to a negative 81. So subtract 81 from both sides to create the equation of X2 + 18X = -81. Now add X2 + 18X. This will create the equation of 20X = -81. Now divide 20 on both sides... X = -4.05.

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Originally Posted by lighunt

You basically need X2 and 18X to add up to a negative 81. So subtract 81 from both sides to create the equation of X2 + 18X = -81. Now add X2 + 18X. This will create the equation of 20X = -81. Now divide 20 on both sides...X = -4.05.

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This is not the correct answer. :rolleyes: