Sum
Expand: (3x + 4y)3.
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Solution
(3x + 4y)3
`= (3x)^3 + 3(3x)^2(4y) + 3(3x)(4y)^2 + (4y)^3`.
`= 27x^3 + 3 xx 9x^2 xx 4y + 3 xx 3x xx 16y^2 + 64y^3`.
`= 27x^3 + 108x^2y + 144xy^2 + 64y^3`
Concept: Expansion of (a + b)3
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