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y ( x +2)³ = (xy + 2y)³
= (xy + 2y) (xy + 2y)(xy + 2y)
= (x²+y² + 2xy² + 2xy² + 4y²) ( xy + 2y )
= (x²+y² + 4xy² + 4y² ) ( xy + 2y )
= x³y³ + 2x³y³ + 4x²y³ + 8xy³ + 4xy³ + 8y³
= y³x³ +8x²y³ + 12xy³ + 8y³
sekarang kerjakan obsennya