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