Question

To verify a3-b2=(a-b)(a2+ab+b2)

Answer 1

a3 - b2 = (a-b)(a + b)whole square

a3-b3=a3-b3

Answer 2

I think u mean
a^3-b^3
To verify it
RHS= (a-b)(a^2 + ab + b^2)
= a^3 + a^2b + ab^2 - a^2b - ab^2 - b^3
= a^3-b^3= LHS