Undetermined coefficients help

  • Thread starter brungus
  • Start date
  • #1
1
0
Hi, new here, im looking for some help on this homework problem. pretty sure you need to separate yp into 2 parts?

anyways, use method of undetermined coeff. to solve

y" + y = x*cos(x) - cos(x)

thanks.
 

Answers and Replies

  • #2
Hootenanny
Staff Emeritus
Science Advisor
Gold Member
9,621
6
Hi, new here, im looking for some help on this homework problem. pretty sure you need to separate yp into 2 parts?

anyways, use method of undetermined coeff. to solve

y" + y = x*cos(x) - cos(x)

thanks.
Hi brungus and welcome to PF,

I'm assuming that you've found the homogeneous solution. For the particular solution, notice that we have a product of two functions of x. How does one usually differentiate a product of two functions?

Also for future reference, we have Homework Forums where you can post all your textbook questions :smile:.
 
  • #3
HallsofIvy
Science Advisor
Homework Helper
41,833
961
Why have you not shown any work? In particular, what do you get for the general solution to the corresponding homogeneous equation?
 

Related Threads on Undetermined coefficients help

Replies
2
Views
2K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
2
Views
983
  • Last Post
Replies
5
Views
1K
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
1
Views
981
Replies
3
Views
430
  • Last Post
Replies
5
Views
780
  • Last Post
Replies
3
Views
2K
Top