Question

Answer this question

Answer 1

Answer: 20ab

Step-by-step explanation:

First, use FOIL to expand each term.

term 1:

$25a^{2} + 5ab + 5ab + b^2$

term 2:

$25a^2-5ab-5ab+b^2$

Then, simply subtract term 2 from term 1.

$20ab$

Hope it helps :) and let me know if you want me to elaborate.