To be more confident next time, remember "BODMAS" for your order of operations
B = Brackets
O = Orders (sqrt, power, etc)
D = Division
M = Multiplication
A = Addition
S = Subtraction
In other words, you should work on brackets first, and then on orders, and then on division, and then on multiplication, and finally on addition and subtraction.
To read more about this, go here
Order of Operations - BODMAS
Mahurshi Akilla