Matrices - Cool math Algebra Help Lessons

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Coolmath Algebra
Matrices Lesson 5 - The Identity Matrix (page 1 of 3)
---- This algebra lesson explains what the identity is and how it works

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Remember how I said that matrix multiplication is NOT commutative? Most of the time?

Try these multiplications:

Whoa, Dude!

You should have noticed two funky things:

	You got the same thing for both

	You got A for both answers! There was just no getting rid of that guy!

There's a good explanation for both of these things:

That B matrix I gave you is a very special guy -- So special that he gets his own letter and name:

THE IDENTITY MATRIX:

I = [ row 1: 1 , 0 row 2: 0 , 1 ]

Continued on the next page

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