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= (x²-2x+1)(x-1)
= x³-x²-2x²+2x+x-1
=x³-3x²+3x-1
2.) (x+2y)³ = (x+2y)(x+2y)(x+2y)
=(x²+4xy+4y²)(x+2y)
=x³+2x²y+4x²y+4xy²+8xy²+8y³
=x³+6x²y+12xy²+8y³
huf... terusin sendiri yah :3