### Online Assignments

Online homework is accessed via the Camosun WeBWorK server.

I will be sending an email to the email address we have on file for you during the first week of classes with the current WeBWork URL and your login information. If you have not received this email in the first week, it is likely that the email address on file is incorrect or outdated, so please send me an email from your current account so that we can get you logged in ASAP!

Alternatively, you can log on using your Camosun student number as your ID (with the leading C and then seven digits), and use that same number for your password.

### FAQ for WeBWorK

Here is my FAQ for the WeBWorK online homework system.

### Homework (Recommended Problems)

These exercises are not to be handed in for marking. Instead, you are encouraged to work on these selected exercises as part of your studying for the course.

- Here are the recommended homework problems for the
- 4th edition
- 3rd edition (use the 3rd edition if you are using the exercise set on D2L)

- Leah has hand-written solutions to many of the practice problems on her own website

### Textbook Corrections

- Section 4.1: for Question 27, if you are wondering why your answer of [-
*i*, 1] is different than the book's answer, remember that any multiple of an eigenvector is also an eigenvector for that lambda. So multiply your vector by*i*and you'll get the book's answer. - Section 4.2:
- the answer to Question 7 has a typo: the first entry in the null space should be -1, not +1.
- for Question 9, if you got [5, -1, 7, 0] and [-3, 2, 0, 7] as your column vectors, then that's a fine answer. The book's anwer is also correct: since [1, 0, 2, 1] = 2/7 [5, -1, 7, 0] + 1/7 [-3, 2, 0, 7], so the book's vectors are in the same plane as my answer, but it's not obvious to me why they chose those vectors rather than the more straightforward ones that we get with the standard procedure.

- Section 5.4: if you are wondering why the second column in the matrix Q has the bottom entry negative rather than the top, what they have is also an eigenvector for lambda=3, it's just been multiplied by -1. So if your answer is the same except the textbook's except that your top entry for the second column is the one that's negative, your answer is perfectly fine.

### Practice Questions

- Gilles' Practice Problems,
including answers, with full hand-written solutions
- For Test #1, do questions 1 to 7, 12
- For Test #2, do questions 8 to 11, 13 to 21
- For Test #3, do questions 22 to 27, 29 to 33

- Leah's Practice Problems, with
Solutions Part I,
Solutions Part II, and
Solutions Part III
- For Test #1, do questions 2 to 6 (omit 1, since we're not doing any proofs)
- For Test #2, do questions 8, 10 to 12
- For Test #3, do questions 13, 14, 15 (but use any method), 16, 17, 18, 23, 24, 26, 29