Determinants Level 5: 2x2 mixed (+/-12). 2x2 diagonal difference. 1. Diagonal formula1. Diagonal formulaDown diagonal minus up diagonal.determinant equals-835-4ad minus bc equals 17down: -8 x -4 = 32up: 3 x 5 = 1532 - 15 = 17|-8 3; 5 -4|: (-8)x(-4) - 3x5 = 17.
