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### Messages - Chang Peng (Eddie) Liu

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1
##### MAT244 Math--Lectures / Question for TT2
« on: December 06, 2014, 08:10:29 PM »
TT2 #1

Solve the following initial value problem
x^3yâ€´âˆ’3x^2yâ€³+6xyâ€²âˆ’6y=âˆ’24xâˆ’1+6lnx

y(1)=âˆ’5/6 , yâ€²(1)=âˆ’2 , yâ€³(1)=2

This was the first question on term test two. Can someone please tell me where this type of question was covered in the textbook? Thank you in advance!

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##### MAT244 Math--Lectures / Re: Particular Solution Question
« on: December 06, 2014, 08:08:35 PM »
That makes sense. Thank you professor.

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##### MAT244 Math--Lectures / Particular Solution Question
« on: December 06, 2014, 01:34:45 PM »
$$y^{(4)}âˆ’3yâ€³âˆ’4y=\sin(t)+8t.$$

apparently the particular solution is $Y = At\cos(t) + Btsin(t) + Ct + D$

I know why it's $At\cos(t) + Bt\sin(t)$ , but I have no idea where the $Ct + D$ is coming from. Can someone please explain this?

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##### MT / Re: MT problem 3
« on: December 05, 2014, 11:57:12 PM »
can someone please tell me what section of the textbook this question was from?

5
##### TT2 / Re: TT2 # 4
« on: November 20, 2014, 12:09:28 AM »
Graph of #4

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##### TT2 / Re: TT2 # 4
« on: November 20, 2014, 12:08:35 AM »
I just showed the steps for finding the second eigenvector..

After that, you would proceed to plug it into the standard general equation for a repeated eigenvalue question.

7
##### TT2 / Re: TT2 # 3
« on: November 19, 2014, 10:37:31 PM »
Picture

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##### TT2 / Re: TT2 # 3
« on: November 19, 2014, 10:37:09 PM »
#3

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##### TT2 / Re: TT2 #2
« on: November 19, 2014, 10:21:18 PM »
2b

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##### TT2 / Re: TT2 #2
« on: November 19, 2014, 10:20:52 PM »
This is what I did... Please feel free to correct me if I'm wrong! :p

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##### MAT244 Math--Lectures / Re: Test #1 Format
« on: October 27, 2014, 12:23:05 AM »
I believe it's all computational. The midterm will cover chapters 2,3,4 and sections 7.5 and 7.6, as posted on the blackboard by the professor.

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##### Quiz 3 / Q3 problem1 (night sections)
« on: October 22, 2014, 09:38:38 PM »
4.3 #2

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##### MAT244 Misc / Re: Test 1 material
« on: October 02, 2014, 09:21:37 PM »
Hi Prof. Ivrii,

Do you mind going over the sections that we covered in chapters 1 and 2? Just so I make sure I don't study things we didn't go over!

Thanks!

14
##### MAT244 Misc / Re: Test 1 material
« on: October 02, 2014, 01:22:29 PM »
Hi Prof. Ivrii,

Can you please also state the materials that might be on the test from chapters 1 and 2, like listing each section like you did for chapter 3?

Thanks!

15
##### Quiz 2 / Quiz 2 Problem 2 (night sections)
« on: October 01, 2014, 10:41:33 PM »
3.4 #14
Solve the given initial value problem. Sketch the graph of the solution and describe its behavior for increasing $t$.
\begin{equation*}
y''+ 4y'+ 4y = 0, \qquad y(-1) = 2,\quad y'(-1) = 1.
\end{equation*}

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