In the study of matrices, you will come across the computation of determinant and their values.
These determinants come in various order.
There are the 2nd order, 3rd order, and so on.
What is this order?
Order is the number of rows and column within the determinant.
Thus, 2nd order determinant has 2 rows and 2 columns.
3rd order has 3 rows and 3 columns.
To calculate the values of these determinants, see below for the methods.
The 2nd order is shown in the first upper line.
Following that is the 3rd order computation, using the special Rule of Sarrus (the simpler form of 3rd order calculation).
This value computed comes in useful to determine other values.
One of the examples is the solution of simultaneous equations and their unknowns.
The technique presented here is thus, basic knowledge in matrices learning.