In this video, the Matrix Inverse of a 3 by 3 matrix is found using Gauss-Jordan method based on elementary row operations is presented.
Question: Find the inverse of the 3 by 3 matrix is given by
\[
\begin{bmatrix}
-1 & 2 & 1 \\
0 & 1 & 1 \\
1 & -1 & -1
\end{bmatrix}
\]
