## Matrices

After we have covered sections 2.1-2.4 in class, then do the practice quiz to self assess your understanding of the Matrix topics before the exam.
The practice quiz is not included in your grade.  You do not turn it in.  Use it for studying for exam.
Quiz document and quiz key document (pdf files) should open in a new window or tab.

### Homework and Resources

#### Section 2.1

• Do problems 1 thru 5, 7, 10, 11, 14-19, 21
##### Video Example

Video example for matrix multiplication, by PatrickJMT https://www.youtube.com/watch?v=sYlOjyPyX3g

#### Section 2.2

• Solve using Gauss Jordan Method: 4x + 12y = 52 , 2x + y = −9
• Do problems 1-4 in textbook
##### Video Examples

Video examples using Row Operations with the Gauss Jordan Method of Elimination to get Reduced Row Echelon form.

OR
• go to Wolfram Alpha  and input your equations to get the answer.
OR
• put the augmented matrix into your calculator using 2nd MATRIX EDIT
Use 2nd MATRIX MATH B:rref with your matrix name from the MATRIX menu to get the answer. You will be required to show work written out using the requested method(s) on quizzes or exams, but you can use this on your calculator to check your solution.

Your calculator has built in row operation functions for Matrices

I think its harder to do using the calculator than by hand, since I usually make questions with fairly easy arithmetic for exams and quizzes.

I find it hard to remember how to use the row operation commands correctly as you need to put the input in exactly correctly in the right order or the calculator will do the wrong thing.

If you want instructions, watch this video from the Learning Assistance Center at Howard Community College. I will not teach this calculator method because I think its easier and faster to do by hand. If you want to learn the calculator commands from this video, you can use this method on the calculator for homework, tests and quizzes.  But I can not help you with this on the calculator

#### Section 2.3

• Do problems 1, 3, 5, 8, 9
• Also do review problems 8a, 8b from section 2.7

#### Section 2.4

• Do problems 1, 3, 4, 5, 7, 8, 9, 10