Math 285, Spring 2009

Graded Homework


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Please write your name and your section on the top right corner of your homework.

Unless otherwise indicated, these problems are from the textbook Differential Equations and boundary value problems, 4th Ed., 2008, by Edwards and Penney. For example Section 1.2: 5 means problem 5 at the end of section 1.2

Note: This is not a complete list. It will be updated during the semester. Please check it often. But it is always best to come to class regularly.

Graded homework policy. The average of your graded homework grades will account for 20% of your final grade. The graded homework with your lowest grade will be dropped and not counted toward your homework average.
To receive full credit for your homework you need to return it in class at the indicated day, or 10 minutes before class in my mailbox in Altgeld Hall (math department) if you can't make it to class for that day. You can return your homework up to a week late for only half of the credit. You will not get any credit (you will get a zero) if you don't return it by then. Please write your name on every sheet of paper and staple them together too. Write only on one side of the paper. I suggest you use a black or blue ink pen. Do not write in red.

Graded Homework 8

Due date: Friday, Apr. 17

9.5: 5 (Derive solution using separation of variables. Show steps)
9.6: 5, 7 (Derive solution using separation of variables. Show steps)
9.6: 13

Graded Homework 7

Due date: Wednesday, Apr. 8

9.3: 14
9.4: 3 (No graph)
9.4: 10 (Find the actual solution x_p)
9.5: 10 (Derive solution using separation of variables. Show steps)

Graded Homework 6

Due date: Friday, Mar. 20

3.8: 2
9.1: 24
9.2: 12
9.3: 6

Graded Homework 5

Due date: Friday, Mar. 6

3.6: 4, 13 (No graphs)
3.8: 5, 7, 14

Graded Homework 4

Due date: Friday, Feb. 27

3.4: 18
3.5: 12, 34, 38, 52
(Read the directions carefully)

Graded Homework 3

Due date: Wednesday, Feb. 18

3.1: 9, 36
3.2: 24
3.3: 16, 20, 24

Graded Homework 2

Due date: Monday, Feb. 9

1.5: 12
1.6: 10, 46
2.2: 6, 18 (by hand)

Graded Homework 1

Due date: Friday, Jan. 30

1.2: 8, 10
1.4: 10, 17, 25

Last changes: Apr. 10, 2009