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Question
Expand : (6a – 7b)3
Sum
Solution
(6a – 7b)3
= (6a)3 – (7b)3 – 3(6a) (7b) (6a – 7b)
= 216a3 – 343b3 – 126ab (6a – 7b)
= 216a3 – 343b3 – 756a2b + 882ab2
= 216a3 – 756a2b + 882ab2 – 343b3
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Cubes of Binomials
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