Question

factorise a(a+b)² -3ab(a+b)​

Answer 1

$a(a + b)^{2} - 3ab(a + b) \\ = a( {a}^{2} + {b}^{2} + 2ab) - 3 {a}^{2} b - 3a {b}^{2} \\ = {a}^{3} + a {b}^{2} + 2 {a}^{2} b - 3 {a}^{2} b - 3a {b}^{2}$