- #1

- 28

- 0

## Homework Statement

I need to find the solution to x'' + cx' = f(t), for a general f.## Homework Equations

## The Attempt at a Solution

Obviously first I solve the homogeneous part to give me A + B*exp(-ct). I also know that the particular solution is written as (1/c)int((1-exp(c(s-t))f(s))ds where the integral is between 0 and t. However I am not sure why this is so, any help would be much appreciated.