i m nt able to get anytng of ths concept plzz hepl :(

First of all make it clear in your mind that what elementary transformations you can apply to find the inverse of matrix.

The elementary transformations that can be applied to a matrix are:

1. Interchange of any two rows or columns of a matrix

 It is denoted as R_i ↔ Rj or C_i ↔ C_j

2. Elements of any row or column multiplied by a non-zero number

 It can be denoted as Ri ↔ kRi of Ci ↔ kCi,where k is a non-zero constant.

3. Addition to the elements of any row or column; the corresponding elements of any other row 

or column multiplied by any non-zero number.

It is denoted as R_i → R_i + kR_j or C_i → C_i + kC_j.

Using these operations we can find the inverse of a given matrix. The steps of algorithm to find the inverse of given matrix are:

Step 1. Obtain the square matrix, say A

Step 2. Write A = I_n A

Step 3. Perform the sequence of elementary operations on A on the LHS and the pre-factor I_n on the RHS till we obtain the result I_n = BA

Step 4. Write A^-1 = B

Here is an example to find the inverse of the given matrix, using the elementary row operations:

Find the inverse of the matrix.

Solution:

Let

Now, A = IA

∴

After getting this concept,you are suggested to go through the study material again. This 

concept is explained nicely with the help of video in our study material.That will help you a lot.

Still if you face any problem, then do get back to us.