The algorithm I use sets it up this way:
D = -3(3-0) - 2(0 - (-3)) - 3(0 - (-3))
= -9 -6 - 9
= -24
KhanAcademy shows 2 basic methods
https://www.khanacademy.org/math/algebra-home/alg-matrices/alg-determinants-and-inverses-of-large-matrices/v/finding-the-determinant-of-a-3x3-matrix-method-2
https://www.khanacademy.org/math/algebra-home/alg-matrices/alg-determinants-and-inverses-of-large-matrices/v/finding-the-determinant-of-a-3x3-matrix-method-1
Evaluate the determinant of each matrix
-3 2 -3
0 -1 -1
3 0 -3
My answer is -36
The correct answer is -24 but I don't understand how they got the answer.
1 answer