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Question
Find the cube of: 4x + 7y
Sum
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Solution
Using (a + b)3
= a3 + b3 + 3ab + (a + b)
(4x + 7y)3
= (4x)3 + (7y)3 + 3(4x) (7y) (4x + 7y)
= 64x3 + 343y3 + 84xy (4x + 7y)
= 64x3 + 343y3 + 336x2y + 588xy2.
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