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

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Question 451619: solve equation by completing the square
x2 + 4x - 36 = 0

Found 2 solutions by ewatrrr, nerdybill:
Answer by ewatrrr(24785)   (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(7384)   (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




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