Answer:
4a^2
Explanation:
When simplifying an expression, the first thing to look for is if you can get rid of any parentheses. Most of the time, you can use the distributive property to get rid of parentheses, by multiplying the factors times the terms inside the parentheses. Then look for any constants that you can combine.
I'm sorry I'm not good at explaining this kind of problem :)
Hope this helps.