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b) n²(n+1)(n²-1) = n²(n³-n +n² -1 ) =n⁵ - n³+n⁴-n²
c) (a-b)(a²+ab+b²)= a³ + a²b +ab² -a²b -ab² -b³ =a³ -b³
d) (x²+x+1)(x²-x+1) =x⁴-x³+x² +x³- x² +x +x²-x+1 =x⁴+x² +1