5^2-2[5(5+4)-25]
Using pemdas I will solve step by step
5^2 - 2[5(9)-25]
5^2 -2[45-25]
5^2 -2[20]
25- 2[20]
25-40
-15
You could obviously combine a couple of steps here and not violate the rules of pemdas or alter the problem but I wanted to show you step by step