0
Anonymous
x2 - 14x = -49
∴ x2 - 14x + 49 = 0
∴ (x - 7)2 = 0
∴ x = 7
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49-apex
63
252-70x+49 = (5x-7)(5x-7) when factored
x2+14x+49 = (x+7)(x+7) when factored