Answer:
12
Explanation:
You go to the point a1,2 ant take out the cross that intersects there. you then find the determinant
[12 24 ]
[-4 -7 ]
12(-7) - (-4)(24)
-84-(-96)
-84+96=12
I hope this helps, not sure what the whole question or the directions where but this is what i got from what you gave me. good luck!