Determinants Level 4: 2x2 mixed (+/-9). 2x2 diagonal difference. 1. Diagonal formula1. Diagonal formulaDown diagonal minus up diagonal.determinant equals7-5-26ad minus bc equals 32down: 7 x 6 = 42up: -5 x -2 = 1042 - 10 = 32|7 -5; -2 6|: 7x6 - (-5)x(-2) = 32.
