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Determinants

Level 17 / realistic untimed

2x2 realistic open (no timer)

3 visual steps / realistic 2x2 signs

1. Signed line

1. Signed lineDown diagonal minus up diagonal.det =-64023075-180|-640 230; 75 -180|D = 97950down: -640 x -180up: 230 x 75det = 97950
-640 x -180.

-640 x -180.

2. Signed term

2. Signed termDown diagonal minus up diagonal.det =-64023075-180|-640 230; 75 -180|D = 97950down: -640 x -180up: 230 x 75det = 97950
230 x 75.

230 x 75.

3. Determinant

3. DeterminantDown diagonal minus up diagonal.det =-64023075-180|-640 230; 75 -180|D = 97950down: -640 x -180up: 230 x 75det = 97950
det = 97950.

det = 97950.

Practice Level 17

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

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