1. Multiplying Matrices
GSE Accelerated Pre-Calculus
Keeper 2

2. Objective – To multiply two matrices.
Two matrices may be multiplied if the number of columns in the first matrix is equal to the number of rows in the second matrix.
2 x 4
4 x 2
These two numbers
must be the same in
order to multiply the
matrices.
Dimensions of Product 2 x 2

3. Describing Matrix Products

4. Examples
For
find each of the following.
a) AB
b) BA
c) AC

5. Examples

6. In Class Assignment Check for Understanding
State whether the product AB is defined. If so, give the dimension of AB.
Find the product. If it is not defined, state the reason.
Using the given matrices, evaluate the expression.