particular solution of high order 2d

y'''' -6y'''+9y''=x

i take y_p=ax+b

i get 0=x

so i cant find the a ,b for the solution

Quote:

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Originally Posted by transgalactic

y'''' -6y'''+9y''=x

i take y_p=ax+b

i get 0=x

so i cant find the a ,b for the solution

---

Your characteristic equation is



so the complimentary solution already contains

Since there is a factor of you must multiply your guess by to get

what are they laws tieing the homogeneus and the practical solutions?

i we have also (r-3)^2 thing
why its not changing the particular solution too
?

whats the general theory on think link thing
?
i dont know how to search it on google

Try this link, it may help.

The Method of Undetermined Coefficients

Also try google Method of undetermined coeffients.