Question

How do you multiply `(4x^2-4y^2)^2`?

Answer 1

`=16x^4+16y^4-32x^2y^2`

Explanation:

`(a-b)^2=a^2+b^2-2ab`

Similarly

`(4x^2-4y^2)^2`

`=(4x^2)^2+(4y^2)^2-2times4x^2times4y^2`

`=16x^4+16y^4-32x^2y^2`