Question

Expand using identity 8a3-27b3​

Answer 1

8a^3-27b^3

=(2a)^3-(3b)^3

=2a=x;3b=y

[x^3-y^3=(x-y)(x^2-y^2+xy)]

[2a-3b][(2a)^2-(3b)^2+2a×3b]