Determinant Formulas
Determinant of Order One
|a11| = a11
Determinant of Order Two
= a 11 a 22 - a 12 a 21
Determinant of Order Three
=
a11 a22 a33 + a12 a23 a 31 + a13 a21 a32 -
- a 13 a22 a31 - a12 a21 a 33 - a11 a23 a32.
Rule of Sarrus
+ sign
− sign