Question

1) (2x+2y) (2x-2y)

2) (2a+b) (2a-b)

Answer 1

1) (2x+2y) (2x-2y) =  4x^2 - 4y^2 ou 4(x^2 - y^2)

2) (2a+b) (2a-b) =  4a^2 - b^2