Question

a(a + b)³ - 3a²b(a + b)​

Answer 1

Answer:

answer is a(a+b)³

Step-by-step explanation:

using identity a+b³

Answer 2

Answer:

$a(a + b) {}^{3} - 3a {}^{2} b(a + b) \\ a(a {}^{3} + b {}^{3} + 3a {}^{2} b + 3ab {}^{2} ) - 3a {}^{3} b - 3a {}^{2} b {}^{2} \\ a {}^{4} + ab {}^{3} + 3a {}^{3} b + 3a {}^{2} b {}^{2} - 3a {}^{3} b - 3a {}^{2} b {}^{2} \\ = a {}^{4} + ab {}^{3}$