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Determinants

Level 3 / realistic untimed

2x2 mixed (+/-5)

1 visual step / 2x2 diagonal difference

1. Diagonal formula

1. Diagonal formulaDown diagonal minus up diagonal.det =-3425|-3 4; 2 5|D = -23down: -3 x 5 = -15up: 4 x 2 = 8-15 - 8 = -23
|-3 4; 2 5|: (-3)x5 - 4x2 = -23.

|-3 4; 2 5|: (-3)x5 - 4x2 = -23.

Practice Level 3

A few quick rounds make the products familiar; the sign is the only thing to guard.

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