Determinante de matriz 4x4 mais simples

Synopsis: In this video we will calculate the determinant of a 4x4 matrix using the matrix triangulation method. Let's turn a 4x4 matrix into an upper triangular matrix and thus obtain, quite simply, the determinant of this matrix, the product of the terms of its main diagonal.
Source: Khan Academy.
URL: http://youtu.be/EpaBPM9GfhI