1. The problem statement, all variables and given/known data Show that if f is infinitely differential and f'(x)=f(x), then theres a constant "c" with f(x)=ce^x. 2. Relevant equations 3. The attempt at a solution I think i'm supposed to begin with an arbitrary function and show that it looks like f(x) = ce^x... but that's as far as I've gotten.