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Determinants

Level 2 / foundation

2x2 (1-9)

1 visual step / 2x2 diagonal difference

1. Diagonal formula

1. Diagonal formulaDown diagonal minus up diagonal.det =8246|8 2; 4 6|D = 40down: 8 x 6 = 48up: 2 x 4 = 848 - 8 = 40
|8 2; 4 6|: 8x6 - 2x4 = 40.

|8 2; 4 6|: 8x6 - 2x4 = 40.

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

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