Determinants Level 1: 2x2 (1-5). 2x2 diagonal difference. 1. Diagonal formula1. Diagonal formulaDown diagonal minus up diagonal.determinant equals3527ad minus bc equals 11down: 3 x 7 = 21up: 5 x 2 = 1021 - 10 = 11|3 5; 2 7|: 3x7 - 5x2 = 11.
