find cube using identity
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Answer:
(x - 7y)^3
= x^3 - 3×x×7y (x-7y) - (7y)^3
=x^3 - 21xy(x-7y) - 343y^3
= x^3 - 21x^2y + 147xy^2 - 343y^3
Hope you get the answer.
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the answer is given in the attachment above.
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