Answer:
Explanation:
I think your determinant is
3 -3
-5 -6
To evaluate this, multiply diagonally: (3)(-6) = -18, followed by -(5)(-6), or 30.
The value of the determinant is then 30 - 18, or 12.
Review: if you multiply DOWN, as we did with (3) and (-6), we give the product the + sign: +(3)(-6) = -18;
if you multiply UP, as we did with (5)(-6), we give the product the negative sign: -(5)(-6) = +30
I urge you to read the rules on evaluating determinants.