Minors and cofactors
Matrices and determinants (introductory) · Mathematics
Study notes
Q: For A = |1 2 3; 0 1 4; 5 6 0|, find M₁₁ and C₁₂. M₁₁: delete row 1, col 1: |1 4; 6 0| = 0 - 24 = -24. M₁₂: delete row 1, col 2: |0 4; 5 0| = 0 - 20 = -20. C₁₂ = (-1)³(-20) = 20.