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Determinants

Level 10 / build-up

3x3 triangular (lower)

3 visual steps / triangular diagonal product

1. Diagonal read

1. Diagonal readread 3, 5, 7.300450217read 3, 5, 73 x 5 x 7det = 105
read 3, 5, 7.

read 3, 5, 7.

2. Multiply diagonal

2. Multiply diagonal3 x 5 x 7.300450217read 3, 5, 73 x 5 x 7det = 105
3 x 5 x 7.

3 x 5 x 7.

3. Determinant

3. Determinantdet = 105.DeterminantRead the diagonal product.det = 105.3 x 5 x 7
det = 105.

det = 105.

Practice Level 10

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

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