MATRICES AND DETERMINANTS
Higher Concepts of Mathematics
Each minor is now multiplied by its signed element and the determinant of the resulting 2 x 2
calculated.
1
1
2
6
3
1
(1
3)
(2
6)
3
(12)
9
4
3
1
6
3
4
(3
3)
(1
6)
4
9
6
12
5
3
1
1
2
5
(3
2)
(1
1)
5
6
1
25
Determinant = (-9) + (-12) + 25 = 4
Example:
Find the determinant of the following 3 x 3 matrix, expanding about row 1.
3
1
2
4
5
6
0
1
4
MA-05
Page 24
Rev. 0
