Question

factorise (a + b)³ - a- b
class 8 maths​

Answer 1

$(a + b) ^{3} -a-b \\ (a + b) ^{3} - (a + b) \\ = (a + b)( \: (a + b) ^{2} - {1}^{2} ) \\ = (a + b)(a + b + 1)(a + b - 1)$