Since ,
put n=0,we have
therefore =3+6-1=8
Thanks for your input slovak,
I understand what you've written, but maybe I should have specified that by "a solution" I'm talking about function such that
I believe you start by finding a characteristic polynomial for the homogeneous equation (or something like that)
which for this would be , factoring to get
So the homogeneous is ?
Then your supposed to find a particular solution of the form any help from here I'm stuck