Question

(a+b)whole cube? It is easy yeah not.

Answer 1

(a+b)^3= a^3+b^3+3 a^2b +3 b^2 a
yes it is easy

Answer 2

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