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Determinants

Level 16 / realistic untimed

2x2 realistic signed (no timer)

3 visual steps / realistic 2x2 signs

1. Signed line

1. Signed lineDown diagonal minus up diagonal.det =250-40075120|250 -400; 75 120|D = 60000down: 250 x 120 =30000up: -400 x 75 =-30000det = 60000
250 x 120 = 30000.

250 x 120 = 30000.

2. Signed term

2. Signed termDown diagonal minus up diagonal.det =250-40075120|250 -400; 75 120|D = 60000down: 250 x 120 =30000up: -400 x 75 =-30000det = 60000
-400 x 75 = -30000.

-400 x 75 = -30000.

3. Determinant

3. DeterminantDown diagonal minus up diagonal.det =250-40075120|250 -400; 75 120|D = 60000down: 250 x 120 =30000up: -400 x 75 =-30000det = 60000
det = 60000.

det = 60000.

Practice Level 16

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

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