Matrices - Cool math Algebra Help Lessons

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Coolmath Algebra
Matrices Lesson 6 - Inverse Matrices (page 2 of 9)
---- This algebra lesson explains how to find the inverse of a matrix

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Let's stick letters in for the numbers:

ax = b ... ( 1 / a ) times ax = ( 1 / a ) times b ... x = b / a

Now, let's rewrite this guy so he's not a fraction:

ax = b ... a^( -1 ) times ax = a^( -1 ) times b ... x = a^( -1 ) times b
This notation is completely division free.

Why did we go through all this?

Because we are dealing with matrices and not numbers! And we can't do division with matrices.

Continued on the next page

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