Suppose you want to calculate the determinant of 3×3 matrix.

## How to calculate Determinant of 3×3 Matrix Using Row Expansion

The naive solution can be row expansion or column expansion. In the next movie we see how to calculate determinant of 3×3 matrix using first row expansion.

## how to calculate Determinant of 3×3 Matrix using the Sarrus rule

The sarrus rule is simple method to calculate determinant of 3×3. It allows to construct the above formula of the first row expansion we see above. However, It is much simpler to remember. Let’s see the Sarrus rule in action: