Solution:
We have 
To get the inverse we will proceed by augmented matrix with elementary row transformation process is as follow:
Let’s proceed
Therefore we have the inverse of the matrix as
Using elementary row transformations, find the inverse of each of the following matrices: ![\left[\begin{array}{ccc} -1 & 1 & 2 \\ 1 & 2 & 3 \\ 3 & 1 & 1 \end{array}\right]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-f03cb7f5858669bd60950918832693a7_l3.png "Rendered by QuickLaTeX.com")
