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(x + 7)(x + 7)
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x2 - 14x = -49 ∴ x2 - 14x + 49 = 0 ∴ (x - 7)2 = 0 ∴ x = 7
x2+14x+49 = (x+7)(x+7) when factored
51.07142857142857
x2+14x+40 = (x+4)(x+10) when factored
x2-14x+49 (x-7)2 or (x-7)(x-7)