Matrix Multiplication

So, this week I am going to do my blog on how to mulitply matrices. It takes a long time but it is very simple. First, I am going to give you a few notes that you will need to know to be able to mulitply matrices.

Note:

• When you mulitply matrices the inner numbers have to match. For example, if you are multipling a 2x3 and a 3x4 then you are able to mulitply it because the inner numbers match.
• Your resulting matrix will be the outer numbers. So working with the problem above, your resulting matrix will be 2x4.
• If your inner numbers do not match then you will not be able to mulitiply them and your answer will be not defined.

So now I am going to work a few examples for you to better understand these types of problems.

Example 1:

• The dimensions of these two are 2x2 and 2x1. The inner numbers match so you are able to mulitiply it.
• You are going to mulitply 4(5)+3(5)=35 and -1(5)+-2(1)=-7
• Your answer is going to look like this:
• 

Example 2: Mulitiply two matrices with the dimensions 2x1 and 2x2.

• You cannot mulitiply these two matrices together because the inner numbers are 2 and 1 and they do not match.
• So your answer is going to be not defined.

And that is it for this weeek! GOOOODBYEEE :D

--Halie