# Math Help - need help w/problem

1. ## need help w/problem

Evaluate: (a-2b)(a + 2b)

My answer

a^2 + -4b^2 = -4a^2b^2

Does that look right?

2. The answer is just $a^2 - 4b^2$

You cannot combine the $a^2$and the $-4b^2$

3. thank you