Bounday-Value Problem: Eigenvalue and Eigenfunctions

physicsfan24
Messages
7
Reaction score
0

Homework Statement


This is the original question:
\frac{d^{2}y}{dx^{2}}-\frac{6x}{3x^{2}+1}\frac{dy}{dx}+\lambda(3x^{2}+1)^{2}y=0

(Hint: Let t=x^{3}+x)
y(0)=0
y(\pi)=02. The attempt at a solution
This might be all wrong, but this is all I can think of
\frac{dt}{dx}=3x^{2}+1

so \frac{d^{2}y}{dx^{2}}-\frac{6x}{\frac{dt}{dx}}\frac{dy}{dx}+\lambda(\frac{dt}{dx})^{2}y=0After this, I do not know how to proceed to eliminate d^{2}y/dx^{2}, much less what else to do. Help!
Thank you very much for your time,
-PhysicsFan24
 
Last edited:
Physics news on Phys.org
holy **** bro are you in my class, MIAMI DADE DEs?? LOL and were both on here lookin 4 help here.

check out my thread, its the whole paper lol. yo you got the answers for any of the others??
 
Umm, I'm in U of Virgina and this is an online HW question... Yes I am taking ODE. You're in my class?
 
nevermind. I am in Miami Florida. But I got the same question as you at the same time. One hell of a coincidence. Let me know if you find the answer, and you can check my thread too, I got the same question posted on there.
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
Back
Top