Question

8(a+b)³-64(a-b)³ find the vakue​

Answer 1

8(a^3+3a^2b+3ab^2+b^3)-64(a^3-3a^2b+3ab^2-b^3)

=8a^3+24a^2b+24ab^2+8b^3-64a^3+192a^2b-192ab^2+64b^3

=-56a^3+216a^2b-168ab^2+72b^3.