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(2x+3y)³
(2x+3y)(2x+3y)(2x+3y)
FOIL the first two:
(4x²+6xy+6xy+9y²)(2x+3y)
Collect like terms in the first parentheses
(4x²+12xy+9y²)(2x+3y)
Multiply each term of the first parentheses by every term in the second parentheses:
8x³+12x²y+24x²y+36xy²+18xy²+27y³
Collect like terms
8x³+36x²y+54xy²+27y³
Edwin