Question

Expand :-
(5a-7b) power 3

plese answer me
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Answer 1

Answer:

$(a-b)^3 = a^3 - b^3 - 3a^2b + 3ab^2$

$(5a-7b)\\= (5a)^3-(7b)^3-3(5a)^2(7b)+3(5a)(7b)^2\\= 125a^3-343b^3-3(25a^2)(7b)+3(5a)(49b^2)\\= 125a^3-343b^3-525a^2b+739ab^2$