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Question
Expand : (a − 2b)3
Sum
Solution
(a − 2b)3 = (a)3 − (2b)3 − 3×a×2b (a − 2b) .........[(a − b)3 = a3 − b3 − 3ab(a − b)]
= a3 − 8b3 − 6ab (a − 2b)
= a3 − 8b3 − 6a2b + 12ab2
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Cubes of Binomials
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