Answer:
the answer is

Explanation:
First, you need to substitute a, b, and c for their sums
So your new problem should look like this...

Then you can begin solving this problem using PEMDAS
So first you're going to start w/ the parenthesis...
which equals 5
Next, you're going to calculate the exponents, so it should look like this...
which equals

So now your problem should look like this...
which equals

So your answer is

hope this helps!
(Try using Symbolab, I use it all the time it gives the correct answer and it gives good explanations.)