Factorization of a ^ 2 (B-C) ^ 3 + B ^ 2 (3-B) 3

Factorization of a ^ 2 (B-C) ^ 3 + B ^ 2 (3-B) 3

3-B should be c-b
a²(b-c)³+b²(c-b)³
=a²(b-c)³-b²(b-c)³
=(b-c)³(a²-b²)
=(b-c)³(a+b)(a-b)