(9x+7)(9x-7) what's the answer

asked Feb 21, 2019 120k views

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3 votes

81x^2 - 49. The middle terms cancel out because of the opposing signs, but the answer is 81x^2 - 49

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6 votes

They cancel each other out because one is + and the other is -.

Cakyus answered Feb 27, 2019

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