Video demonstrating how to find the determinant of a 4x4 matrix by using row operations and row replacements to get the matrix into upper triangular form. [9:13]

A video lesson proving that the determinant of an upper triangular matrix is the product of the all of the entries along the main diagonal. Includes a concrete example. [8:07]

This video, shows how to calculate a 4x4 determinant by putting in in upper triangular form first.

A video lesson proving that the determinant of an upper triangular matrix is the product of the all of the entries along the main diagonal