Simplify (x + y)3
- (x - y)3
- 6y(x + y) (x - y).
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Answer:
(x+y)^3-(x-y)^3-6y(x+y)(x-y)
=(x+y)^3-(x-y)^3-3(x+y)(x-y){(x+y)-(x-y)
={(x+y)-(x-y)}^3
=(x+y-x+y)^3
=(2y)^3
=8y^3
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