Please answer with steps as soon as possible

asked Jul 25, 2022 134k views

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$(9m + 7n) ^(2) - (9m - 7n) ^(2) \\ = (9m + 7n + 9m - 7n)(9m + 7n - 9m + 7n) \\ = 18m * 14n \\ = 252mn$

Answer:

C. 252 mn

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