Answer:
Explanation:
x² + 13x + 36= 0
x² + 4x + 9x + (9*4)= 0
x*(x + 4) + 9*(x + 4) = 0
(x+4) (x +9) =0
x + 4 = 0 or x + 9 = 0
x = -4 ; x = -9
x^2 + 13x + 36 = (x+4)(x+9)
x = -4 or x = -9
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