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Posted: 4/29/2011 6:06:52 PM EDT
Convert the following into a system of 1st order DEs:

y'' + 2xy' + (y^2)Sin(x) = e^x

y(0) = 1
y'(0) = 2

KTHANX
Link Posted: 4/29/2011 6:09:15 PM EDT
We are not gonna do your damn ODE homework.

Do you have a specific question about a technique to use?
Link Posted: 4/29/2011 6:11:01 PM EDT
ok, i see that this is a nonlinear equation.

that is where i'm hung up. Honestly, any direction would be grand
Link Posted: 4/29/2011 6:11:39 PM EDT
I wish I had GD back then.  ODEs are hard as shit.

Link Posted: 4/29/2011 6:16:58 PM EDT
42.



sorry. hopefully someone helpful posts
Link Posted: 4/29/2011 6:18:55 PM EDT
The answer is..........4?




Link Posted: 4/29/2011 6:26:45 PM EDT
Sorry, the math help thread is posted in Team.
Link Posted: 4/29/2011 6:27:45 PM EDT
Um....2? No, 288.
Link Posted: 4/29/2011 6:28:51 PM EDT



Originally Posted By VBC:


I wish I had GD back then.  ODEs are hard as shit.





lol.  PDEs make ODEs seem easy as cake.



 
Link Posted: 4/29/2011 6:29:31 PM EDT
Originally Posted By Naf:

Originally Posted By VBC:
I wish I had GD back then.  ODEs are hard as shit.


lol.  PDEs make ODEs seem easy as cake.
 


baby steps bro
Link Posted: 4/29/2011 6:30:52 PM EDT
Originally Posted By Naf:

Originally Posted By VBC:
I wish I had GD back then.  ODEs are hard as shit.


lol.  PDEs make ODEs seem easy as cake.
 


I breezed right through PDEs.  That was in Calc III Vectors and Matrices.  ODEs gave me trouble for some reason.
Link Posted: 4/29/2011 6:42:58 PM EDT
1) Assign state variables
2) Make state equations
3) Put into state space form and include output equation


Link Posted: 4/29/2011 7:06:25 PM EDT
Horse shit.  I knew none of you all could solve this shit.  It's cause you're full of shit.


Or else, not enough time has elapsed yet.
Link Posted: 4/29/2011 7:12:20 PM EDT
Originally Posted By UncleJerr:
Convert the following into a system of 1st order DEs:

y'' + 2xy' + (y^2)Sin(x) = e^x

y(0) = 1
y'(0) = 2

KTHANX


What is this? The same type of math Congress uses?
Link Posted: 4/29/2011 7:14:10 PM EDT
Originally Posted By vaughn4380:
Originally Posted By UncleJerr:
Convert the following into a system of 1st order DEs:

y'' + 2xy' + (y^2)Sin(x) = e^x

y(0) = 1
y'(0) = 2

KTHANX


What is this? The same type of math Congress uses?


It's acually a legitimate problem.
Link Posted: 4/29/2011 7:20:50 PM EDT
[Last Edit: 4/29/2011 7:21:50 PM EDT by vaughn4380]
Originally Posted By VBC:
Originally Posted By vaughn4380:
Originally Posted By UncleJerr:
Convert the following into a system of 1st order DEs:

y'' + 2xy' + (y^2)Sin(x) = e^x

y(0) = 1
y'(0) = 2

KTHANX


What is this? The same type of math Congress uses?


It's acually a legitimate problem.


Perhaps I should have used a smiley to express my intentions......like this one
Link Posted: 4/29/2011 7:28:42 PM EDT
Laplace or change of variables?

Been awhile since I have done one of those.
Link Posted: 4/29/2011 7:40:31 PM EDT
Originally Posted By UncleJerr:
Convert the following into a system of 1st order DEs:

y'' + 2xy' + (y^2)Sin(x) = e^x

y(0) = 1
y'(0) = 2

KTHANX


I just took my last Differential Equations test today.  I wish I could help you but we never covered this stuff.
Link Posted: 4/29/2011 8:08:47 PM EDT
Originally Posted By VBC:
Horse shit.  I knew none of you all could solve this shit.  It's cause you're full of shit.


Or else, not enough time has elapsed yet.


Actually, I solved it on a piece of scratch paper. I told you how to do it why have you not figured it out?

I will give you another clue. It is a method used in controls and it only takes simple algebra manipulation to create the equations.
Link Posted: 4/29/2011 8:12:24 PM EDT
Originally Posted By pepe-lepew:
Originally Posted By VBC:
Horse shit.  I knew none of you all could solve this shit.  It's cause you're full of shit.


Or else, not enough time has elapsed yet.


Actually, I solved it on a piece of scratch paper. I told you how to do it why have you not figured it out?

I will give you another clue. It is a method used in controls and it only takes simple algebra manipulation to create the equations.


Here, I am really feeling generous tonight, State Space
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