1. Section 13-4: Matrix Multiplication
Objective:
Scalar Multiplication.
Matrix Properties.
Identify whether or NOT matrices can be multiplied.
Matrix Multiplication.

2. Scalar Multiplication: To perform scalar multiplication, multiply each element in the matrix by the scalar.

3. Matrix Properties (see pg. 586)1) 2) 3)
Note: Division of matrices is NOT possible. 4) 5)
Dc=-34, Dx=34, Dy=-136, x=-1, y=4

4. Can the Matrices Be Multiplied?
For matrix multiplication to be possible, the number of columns of the first matrix must be the same as the number of rows of the second matrix.
1) ) 4)
5) )

5. Multiplication Example