1. First cofactor box
1. First cofactor box
box 1
box 2
box 3
Show 8 times its 2x2 minor.
3x3 open challenge (no timer)
4 visual steps / 3x3 cofactor boxes
2. Second cofactor box
2. Second cofactor box
box 1
box 2
box 3
Settle box 1; show the next 2x2 minor.
3. Third cofactor box
3. Third cofactor box
box 1
box 2
box 3
Settle box 2; show the final 2x2 minor.
4. Add three boxes
4. Add three boxes
box 1
box 2
box 3
600 + (-216) + 165 = 549.
Practice Level 20
A few quick rounds make the products familiar; the sign is the only thing to guard.
Start Level