(2x+y) whole cube + (x+2y) whole cube
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Answer:9(x+y)[x²+xy+y²]
Step-by-step explanation:
(2x+y)³+(2y+x)³=(2x+y+2y+x)[(2x+y)²-((2x+y)(2y+x))+(2y+x)²]
=(3x+3y)[4x²+4xy+y²-4xy-2x²-2y²-xy+4y²+4xy+x²]
=3(x+y)[3x²+3xy+3y²]
=9(x+y)[x²+xy+y²]
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