1. Signed line
expand row 1.
3x3 (+/-4)
3 visual steps / 3x3 signed cofactors
2. Signed term
-1 x 7.
3. Determinant
det = 31.
Practice Level 12
A few quick rounds make the products familiar; the sign is the only thing to guard.
Start Level3 visual steps / 3x3 signed cofactors
expand row 1.
-1 x 7.
det = 31.
A few quick rounds make the products familiar; the sign is the only thing to guard.
Start Level