Write down the 2x2 matrix whose determinate is ad - bc
Let's call this matrix A.
Write down matrix -3A
Determine the determinate of this matrix.
Compare with above.

Both rows got multiplied by -3 so the entire determinant was multiplied by (-3)(-3)= 9. Since the original determinant was 3, the new determnant will be (3)(9)= 27 as you say you got.

Hahah sorry for the confusion but yes this guy hit it spot on.

Those are my answers in the box and I had already put an answer in to try it because it tells you whether you're right or wrong. I have unlimited tries.

Probably should have posted it without an answer in the box but you get the idea...