Let, A = \( \begin{bmatrix} -1 &1 & 2 \\[0.3em] 1 & 2 & 3\\[0.3em] 3 & 1& 1 \end{bmatrix}\)
Now we are going to write the Augmented Matrix followed by matrix A and the Identity matrix I, i.e.,
Now our job is to convert the matrix A into Identity Matrix.
Therefore, the matrix we will get converting the matrix I will be our A-1.
Here, the matrix A is converted into Identity matrix.
Therefore, we get the A-1 as,
The value of A-1 is correct or not can be verified by the formula: AA-1 = I