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Question
Find the cube of: 2a - 5b
Sum
Solution
Using (a - b)3
= a3 - b3 - 3ab (a - b)
(2a - 5b)
= (2a)3 - (5b)3 - 3(2a) (5b) (2a - 5b)
= 8a3 - 125b3 - 30ab (2a - 5b)
= 8a3 - 125b3 - 60a2b + 150ab2.
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