Determinant of a Matrix

There are several strategies to finding the determinant of the matrix. The basic strategy for a 2X2 matrix is to multply the top left number by the bottom right number and subtract the product of the two remaining numbers. Anything bigger than a 3X3 requires a complicated process of finding minors and cofactors that can be seen in action here:

http://www.educreations.com/lesson/view/determinant-of-a-matrix/16850106/?s=ciem9G&ref=link

For 3X3's, you can rewrite the first two columns of the matrix to the right of the matrix and multiply numbers diagonally, then add and subtract. This strategy is also seen in that Educreations video.