Thanks for replying.

I've stumbled upon that wiki article before, problem is, I'm still fairly new to determinants, so most of these explanations make no sense to me (hence why I wanted a full example).

This is what I know, however :

1-To use this method :

To get the determinant of a 3x3 matrix.

2-To use the "Laplace formula" to get the determinant of a 4x4 matrix by using minors and the method above for the 3x3 matrices.

I tried applying this to a 5x5 matrix, by using Laplace's formula to get 5 4x4 matrices (minors) and then using No. 1 mentioned above to get the determinants, but I'm guessing "No. 1" works only for 3x3 matrices? Because my result was incorrect.