Factorization (2a + b) ^ 2 - (2a-b) ^ 2

Factorization (2a + b) ^ 2 - (2a-b) ^ 2

(2a+b)^2-(2a-b)^2
=(2a+b-2a+b)(2a+b+2a-b)
=2b×4a
=8ab