Question

$(x + y)3 + (y - 2x)3 + (x - 2y)3$

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Answer 1

(x + y)3 + (y - 2x)3 + (x - 2y)3

open all the brackets with identity

( a + b )³ = a³ + b³ + 3a²b + 3ab²

( a + b )³ = a³ + b³ + 3a²b + 3ab² ( a - b )³ = a³ - b³ - 3a²b + 3ab²

=(x^3+y^3+3x^2y+3xy^2)+ (y^3-8x^3-6y^2x+12yx^2)+

x^3-8y^3-6x^2y + 12xy^2

= -6x^3 +-6y^3+9x^2y+9xy^2

Answer 2

Answer:

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