Need help on this differential equation

  • Thread starter cpamieta
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  • #1
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Homework Statement


Well this is a physics problem, need find the potential function



Homework Equations


[itex]\Psi[/itex] =Axe-kx A and k are constants
I need to find d2 [itex]\Psi[/itex]/dx2


The Attempt at a Solution


I thought u would just take the derivative two times
but just d[itex]\Psi[/itex]/dx = Ae-kx-kAxe-kx
Would i do something like this?
http://tutorial.math.lamar.edu/Classes/DE/Linear.aspx
thanks
 

Answers and Replies

  • #2
vela
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What's the problem with just differentiating it again?
 
  • #3
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i forgot how you do a differential equation, i have the solutions. I want to know how you do the dΨ/dx
i thought it would just be dΨ/dx= -A/ke-kx Its been a long summer lol
 
  • #4
vela
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You don't have a differential equation. You're simply differentiating a function twice.

For this particular function, you need to use the product rule and chain rule, and you need to know how to differentiate a polynomial and an exponential.
 
  • #5
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o ok thxs the wolfan alpha thing said it was when i typed it in. It also gave somthing different
 

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