Answer: 20ab
Step-by-step explanation:
First, use FOIL to expand each term.
term 1:
[tex]25a^{2} + 5ab + 5ab + b^2[/tex]
term 2:
[tex]25a^2-5ab-5ab+b^2[/tex]
Then, simply subtract term 2 from term 1.
[tex]20ab[/tex]
Hope it helps :) and let me know if you want me to elaborate.
