well lets do this step by step.
5(2+3)
PEMDAS: When we look at PEMDAS we see parenthesis are first
So 2+3 equals 5.
Lets look at PEMDAS again, we see the next step is exponents so the 5 would need to be multiplied since it has no symbol and is next to the parenthesis.
Now we need to multiply what we got from 2+3 (which is 5) and the five that needs to be multiplied.
if you multiply 5x5 your answer will be 25!