The answer is 2 because if you use this thing called BODMAS which means
Brackets ()
Operations ( Squaring, Cubing etc..)
Division ÷
Multiplication ×
Addition +
Subtraction -
If you do it in that order it is
8 - 2 = 6
6 x 4 = 24
24 ÷ 12 = 2
That is how I got that answer. I am not sure whether it is right though.