SOLUTION: solve equation by completing the square x2 + 4x - 36 = 0

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 Click here to see ALL problems on Systems-of-equations Question 451619: solve equation by completing the square x2 + 4x - 36 = 0Found 2 solutions by ewatrrr, nerdybill:Answer by ewatrrr(10682)   (Show Source): You can put this solution on YOUR website!``` Hi completing the square x2 + 4x - 36 = 0 (x+2)^2 - 4 - 36 = 0 (x+2)^2 = 40 x+2 = ± = ± x = -2 ± ```Answer by nerdybill(7003)   (Show Source): You can put this solution on YOUR website!x^2 + 4x - 36 = 0 x^2 + 4x = 36 half 'b' and square it -- then add to both sides x^2 + 4x + 4 = 36 + 4 (x+2)(x+2) = 40 (x+2)^2 = 40 x+2 = sqrt(40) x+2 = sqrt(2*2*2*5) x+2 = 2*sqrt(2*5) x+2 = 2*sqrt(10) x = 2*sqrt(10) - 2 x = 4.325