g) (x + y)^3 – x(x + y)^2.
g) (x + y)3 – x(x + y)2.
g) (x + y)3 – x(x + y)2
= (x + y)2.(x + y) – x(x + y)2
= (x + y)2 (x + y ‒ x)
= y(x + y)2.