Question

Need explanation on how to find the product matrix of two 3*3 matrix.

Answer 1

When two matrices are 3x3 Then op matrix is also 3x3. Multiply each row element of 1st matrix with each column element of second matrix and add the values.

Example :
Row is 2 3 4 and column is
1
2
3

Multiply and add = 2*1 + 2 * 4 + 2*3 = 16
= 3*1+3*2+3*3 = 19
= 4*1 + 4*2 + 4*3 = 24

Hence op matrix first row is 16 19 24.

You can use this https://www.easycalculation.com/matrix/learn-matrix-multiplication.php
https://www.easycalculation.com/matrix/matrix-multiplication.php

Answer 2

Look at this. I learned matrix multiplication using this website.
http://www.purplemath.com/modules/mtrxmult.htm