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Anonymous
x=7
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Yes because if x2-14x+49 then it is (x-7)(x-7) when factored
x2-14x+49 (x-7)2 or (x-7)(x-7)
2x2 + 21x + 49= 2x2 + 14x + 7x + 49= 2x(x + 7) + 7(x + 7)= (x + 7)(2x + 7)
x2+14x+49 = (x+7)(x+7) when factored
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