Determinants of order two and three
Matrices and determinants (introductory) · Mathematics
Study notes
Q: Find (a) |3 2; 1 4| (b) |1 2 3; 0 1 4; 5 6 0|. (a) 3×4 - 2×1 = 10. (b) Expand row 1: 1(1×0-4×6) - 2(0×0-4×5) + 3(0×6-1×5) = 1(-24) - 2(-20) + 3(-5) = -24 + 40 - 15 = 1.