# MA226 Diff Eqns Summer1 2017

### Mon Tues Thurs 6-8:30 pm @ PHO 202 (8 St. Mary's Street)

### Announcements

- There will be extra office hours Wednesday June 28 from 5-7pm.
**Location TBA**. - FINAL EXAM: Thursday, June 29.
- Last semester's exams, including the final are available under Documents.
- You will have the entire class period (150 min) to take the exam.
- The exam will cover sections 1.1-1.9, 2.1, 2.2, 3.1 - 3.3 from before the midterm, with an emphasis on 3.4-3.6, 4.1-4.3, 5.1-5.2, 6.1-6.4.

### Homework

HOMEWORK DUE AFTER MIDTERM- Chapter 6 Laplace Transforms
- 6.1 - 1-3, 7-14, 15-23 odd, 25
- 6.2 - 1, 3, 4-13, 15
- 6.3 - 11-18, 27-33
- 6.4 - 1-5 we did 6.4.4 in lecture, and we can do #2 in class Tuesday

- Chapter 5 Nonlinear Systems
- 5.1 - 1, 3, 7-15 odd, 26-29

For 7-15b, I didn't do this in class, but try sketching them by hand at the same time as using technology

26-29 are tough, but try them out. We can go over them in class - 5.2 - 1, 4, 5-13 odd, 15

- 5.1 - 1, 3, 7-15 odd, 26-29
- Chapter 4 Forcing and Resonance
- 4.1 - 9-17 odd, 21-27 odd, 33, 35
- 4.2 - 1-13 odd, 17, 19, 20
- 4.3 - 1-21 odd, 23

- Chapter 3 Linear Systems
- 3.4 - 1, 2, 3-13 odd, 19, 20
- 3.5 - 1-7 odd, 11, 13, 17, 19, 21, 22
- 3.6 - 13-29 odd

- Chapter 3 Linear Systems
- 3.1 - 5-8, 16,17,25,27
- 3.2 - 1-13 odd, 19-23 odd
- 3.3 - 1-11 odd, 13-16, 21

- Chapter 2 First Order Systems
- 2.1 - 1,2,8,9-14,18
- 2.2 - 8,11-14,16,18,21,23,25

- Chapter 1 First Order Differential Equations
- 1.1 - 1-6, 11-14, 17, 18
- 1.2 - 1, 7, 10, 14, 15, 17, 19, 20, 22, 24, 33, 35, 37, 41, 42
- 1.3 - 1a, 3a, 5a, 13, 14, 16
- 1.4 - 1, 2, 5, 6.

Use technology for 1,2. Try 5,6 by hand (but with a calculator). - 1.5 - 1-8, 13, 15
- 1.6 - 1, 2, 4, 5, 7, 13, 14, 16, 17, 19, 30, 31, 32, 34, 35, 36.

For #13-21, some of the detail in the graphs in the back of the book is unrealistic to sketch by hand. - 1.7 - 1-9, 13, 19, 20
- 1.8 - 1-11 odd,17,21,23,29,31
- 1.9 - 1-13 odd, 24,25,26a,27

### Quick reference

- Text: Differential Equations 4E by Blanchard, Devaney, Hall
- There is one copy available to be taken out, and one copy on reserve (can't be removed from the library) at the Science & Engineering Library @ 38 Cummington Mall
- Software: Cengage DETools no install .jar file
- Office hours: Mon Tues Thurs 5-5:50 pm @ MCS B46B
- Email: changer@bu.edu
- Tutoring room hours: Mon Tues Thurs 10am - 6pm, Wed 10am - 4pm

### Significant dates

- May 29 Monday - no classes because of Memorial Day
- May 30 Tuesday - last day to drop without a "W"
- June 2 Friday - makeup day
- June 8 Thursday - MIDTERM
- June 15 Thursday - last day to drop
**with**a "W" - June 29 Thursday - last day of class and FINAL EXAM

### Documents

- How to get the general solution for repeat e'val
- Notes on 2.1, 2.2 from Friday lecture
- Spring 2017 Midterm 1 Look at all but 1DEF, 4B
- Spring 2017 Midterm 1 solutions
- Spring 2017 Midterm 2 MIDTERM 1: Look at 1ABC, 2. FINAL: Look at all but 5
- Spring 2017 Midterm 2 solutions
- Spring 2017 Final Look at all but 1DEFI
- Spring 2017 Final solutions
- Syllabus
- Schedule

### Quiz and Exam solutions

- quiz 13 solutions
- quiz 12 solutions
- quiz 11 solutions
- quiz 10 solutions
- quiz 9 solutions
- quiz 8 solutions
- quiz 7 solutions
- Midterm solutions some of the coefficients for the cubic guess are incorrect
- quiz 6 solutions
- quiz 5 solutions
- quiz 4 solutions
- quiz 3 solutions
- quiz 2 solutions
- quiz 1 solutions