In this case, we will choose the first row. The determinant of a 3x3 matrix can be calculated as follows:
$$
\text{det}(A) = a_{11}(a_{22}a_{33} - a_{23}a_{32}) - a_{12}(a_{21}a_{33} - a_{23}a_{31}) + a_{13}(a_{21}a_{32} - a_{22}a_{31})
$$
where $a_{ij}$
Show more…