(a-1)^2(a+1)+(a+1)(a-1) при a=-3

Question

(a-1)^2(a+1)+(a+1)(a-1) при a=-3

Answer 1

(a-1)^2(a+1)+(a+1)(a-1) =[(а-1)(а+1)]*(a-1+1) = (a²-1)*a = ((-3)²-1)(-3) = 8*(-3) = -24