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Determinants

Level 5 / foundation

2x2 mixed (+/-12)

1 visual step / 2x2 diagonal difference

1. Diagonal formula

1. Diagonal formulaDown diagonal minus up diagonal.det =-835-4|-8 3; 5 -4|D = 17down: -8 x -4 = 32up: 3 x 5 = 1532 - 15 = 17
|-8 3; 5 -4|: (-8)x(-4) - 3x5 = 17.

|-8 3; 5 -4|: (-8)x(-4) - 3x5 = 17.

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

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