Expand : (3a - 4b)^3
(step by step)
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Step-by-step explanation:
(a-b) ³= a³-b³-3ab(a-b)
= (3a) ³-(4b) ³-3×3a×4b(3a-4b)
= 27a³-64b³-108a²b+144ab²
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