6(x + 2y)3 + 8(x + 2y)2
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6(x+2y)³+8(x+2y)²
=6(x+2y)(x+2y)(x+2y)+8(x+2y)(x+2y)
=6(x³+4y²x+4x²y)+8(x²+4xy+4y²)
=6x³+24xy²+24x²y+8x²+32xy+32y²
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