(x⁷-x⁵)(x³+x²)=x¹⁰+x⁹-x⁸-x⁷
(2k²-1)(2k+1)=4k³+2k²-2k-1
(3-p³)(p²+1)=3p²+3-p⁵+p³
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(x⁷-x⁵)(x³+x²)=x¹⁰+x⁹-x⁸-x⁷
(2k²-1)(2k+1)=4k³+2k²-2k-1
(3-p³)(p²+1)=3p²+3-p⁵+p³