- #1
faradayscat
- 57
- 8
Homework Statement
Particular solution of
y" - y' - 2y = e^(2x)
Homework Equations
None
The Attempt at a Solution
This makes no sense to me, why do I have to use the solution of the form
y(t) = cxe^(2x)
For the problem above, but when I switch the signs and it becomes
y" - y' + 2y = e^(2x) (notice the +2 in front of y)
The solution becomes y(t) = ce^(2x)
I get that it WORKS, but why? Am I seriously supposed to remember hundreds of forms for solutions when I solve these types of DE's or do I solve these with trial and error? It's ridiculously tedious trying several different forms just to realize it doesn't work at the end.