Ok so I know that this is problem realllly easy, but nevertheless..
the family of functions is y = ce^(-2x) + e^(-x)
the solution of the equation is y' + 2y = e^(-x)
I have to find the constant c which defines the solution which also satisfies the initial condition y(-3)=10
now i started out finding y' and then plug in the initial condition...
I'm getting stuck. Any help??