48÷2(9+3) = 2 or 288
( ) First. So 9+3 = 12. This is still between ( ), so you do 2 * 12 = 24. Then 48/24 = 2.
And the wrong way:
48/2 = 24, then * (12) = 288.
You always need to calculate the ( ) first, then / or * and after that + and -. That is why the second answer is wrong imo.