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Khan Academy
Khan Academy: Linear Algebra: Rule of Sarrus of Determinants
A video lesson presenting the Rule of Sarrus for finding the determinants of 3 x 3 matrices. The rule is derived algebraically and then used in a concrete example to find the determinant of a given 3 x 3 matrix. [7:18]
Sophia Learning
Sophia: Finding the Determinant of a 3 X 3 Matrix Using Sarrus' Rule: Lesson 3
In this lesson students will learn how to find the determinant of a 3x3 matrix using Sarrus' Rule. It is 3 of 6 in the series titled "Finding the Determinant of a 3 x 3 Matrix Using Sarrus' Rule."