An instructional video that gives a recursive definition for the determinant of an N x N matrix based on cofactor expansion. Uses the definition to find the determinant of a concrete 4 x 4 matrix. [18:40]

A video lesson describing how the determinants for larger matrices can be found using cofactor expansion on any row or column. Illustrates that it is helpful to choose rows or columns with zeros in order to simplify the computations....

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]

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