1. Warm Up

2. Multiplying Matrices 6.2 part 2

3. **Multiply rows times columns. **You can only multiply if the number of columns in the 1 st matrix is equal to the number of rows in the 2 nd matrix. Dimensions: 3 x 2 2 x 3 They must match. The dimensions of your answer.

4. Example 1 2(3) + -1(5)2(-9) + -1(7)2(2) + -1(-6) 3(3) + 4(5) 3(-9) + 4(7)3(2) + 4(-6)

5. Dimensions: 2 x 3 2 x 2 *They don’t match so can’t be multiplied together.* Example 2

6. Example 3

7. Example 4: you try!

8. 2 x 2 2 x 2 *Answer should be a 2 x 2 0(4) + (-1)(-2)0(-3) + (-1)(5) 1(4) + 0(-2) 1(-3) +0(5)

9. Example 5: combining operations. Remember PEMDAS!

10. Homework: Kuta worksheet, problems 1-8.