Day 10, Mat119: Pre-Calculus

Last time: Discussion of problems, section 3.1

Next time: Section 3.7

Today:

Announcements
- You have a homework due today: (pp. 229--)
- You have an exam in exactly one week. Will you be ready? The exam will cover material from chapter 2, and section 3.1.
- I've pushed back all other homework until after the exam (see the assignment page). So now you should begin reviewing.
- Here's a sheet of common algebra mistakes (from this website).
- Return of your homework (pp. 205--): graded #5, 13, 55, 58. Some comments:
  1. Justify your work! I'm still getting the relatively worthless "yes" or "no" answers, and the value of such answers will gradually be reduced to 0....
  2. #5: fails the HLT -- hence it's not invertible
  3. #13: passes the HLT, hence is one-to-one and hence invertible.
  4. #55: solve for x as a function of y.
  5. #58: ditto. But this time there is a risk -- when you square a result. However, because the domain of x was restricted to only positive values of x, you know which sign to choose.
Our word for the day:

Polynomials

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