Both are correct!
It depends on the convention.
If division has lower precedence than multiplication, then the multiplication is done first, 2*12=24, then the division 48/24 = 2.
If division and multiplication have equal precedence, then the division is done first, 48/2 = 24, then the multiplication, 24*12=288.
So both could be correct depending on how the operator precedence is treated.
That is to say, when you type “48/2(9+3)” on the calculator, you are talking to a computer not a human. You have to conform to its rules of operator precedence.