Question

factorise each of the following. 729 a cube -343 b cube

Answer 1

9³a³-7³b³
(9a)³-(7b)³
=(9a-7b)(81a²+63ab+49b²)
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Answer 2

the identity present is a cube - b cube = (a-b)(a square + ab + b square)
so the answer is (9a-7b)(81a square +63ab + 49b square).
these are the factors.

hope it helps.
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