Category: Announcements (Page 2 of 3)

1. Drop-in virtual tutoring is available from the Math Department; Monday hours are from 9am to 8pm. See the tutoring page for more details.
2. I will hold an extra office hour on Monday, November 7 at 3pm in N707 and on Zoom. Even if you don’t have questions yourself, if you are available, please drop by; other people will probably have questions you haven’t thought of yet! https://us02web.zoom.us/j/84245735955?pwd=ZEU4QzNsSlJONXpwQk9YU1huOFhjZz09

Test #1 will be given in class on Tuesday, September 20. The test has 5 questions; you will answer all 5. All questions are based on material from Chapter 2 (everything we’ve seen so far in class). Make sure you indicate which method you are using and show all your work for each question. Your work may earn partial credit.

For linear first order equations, the method of integrating factors will earn zero credit; use variation of parameters instead (see Section 2.1 of the textbook, not Lesson 2 from the course hub).

You are allowed to bring a cheat sheet with you:

• one side of one letter-sized sheet of paper (notebook paper is fine)
• hand written by you
• you will hand your cheat sheet in with your test (put your name at the top)

For the set 2-SeparableEquations, some of the questions ask for your solution explicitly (this means y=….) and some of them ask for your solution implicitly (this means that x and y are in an equation together). Be careful to pay attention to what each question is asking for.

For the set 3-TransformNonlinearToSeparable, the answer checkers for some of the problems are a little finicky. If you are confident in your answer but WeBWorK is not accepting it, try treating your constant c as a variable instead of “all possible constants” like we do in class. That is, you pick up your +c in your integration step, and you don’t do anything fancy like we do in class… for example, in class if we had a +2c term as part of a solution, we’d just change it to +c since twice “all possible constants” is just “all possible constants” again. Some WeBWorK problems can handle this, but not all of them, so if you were having trouble in this example, you’d just leave that term as +2c.

Hope this helps!