Determinant of a 3x3 matrix

Find the determinant of a given 3x3 matrix.

Inverting a 3x3 matrix using determinants Part 1: Matrix of minors and cofactor matrix

Sal shows how to find the inverse of a 3x3 matrix using its determinant. In Part 1 we learn how to find the matrix of minors of a 3x3 matrix and its cofactor matrix.

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# Inverting a 3x3 matrix using Gaussian elimination

Sal explains how we can find the inverse of a 3x3 matrix using Gaussian elimination. Created by Sal Khan.