Question

5a4 - 5a3+ 30a2 - 30a​

Answer 1

$5 {a}^{4} - 5 {a}^{3} + 30 {a}^{2} - 30a \\ 5 {a}^{3} (a - 1) + 30a(a - 1) \\ (a - 1)(5 {a}^{3} + 30a)$