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

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

User Riegardt Steyn
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They cancel each other out because one is + and the other is -.
User Cakyus
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