Determinant of a 3x3 matrix
Find the determinant of a 3x3 matrix,
,
by using the cofactor expansion.
Explanation
The cofactor expansion of $A$ along the first column is
Calculating the 2x2 determinant in each term,
From these,
we obtain
Example:
The determinant of
is
Calculator
Enter a 3x3 matrix and press "Execute" button. Then the determinant is displayed.
$|A|$
=