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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