Question 451619
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Hi
completing the square
x2 + 4x - 36 = 0
 (x+2)^2 - 4 - 36 = 0
   (x+2)^2 = 40
    x+2 = ± {{{sqrt(40)}}} = ±{{{sqrt(4*10)}}}
     x = -2 ±{{{2sqrt(10)}}}