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b). (3+x)(9-3x+x²)=3³+x³=27+x³
c). (y+4)(16-4y+y²)=y³+4³=y³+64
d). (2-y)(4+2y+y²)=2³-y³=8-y³
e). 25+5x+x²)(x-5)=x³-5³=x³-125
f). (√2-z)(z²+1+√2z)=(√2)³-z³=2√2-z³