yea it is after stayin a while in the library and looking at a couple of books i finally figured it out.
and it was x1-x2 and x2-x1 i really should have looked at my drawing again after it was posted it was much clearer before i pressed on submit (alot of empty spaces weren't there anymore)...
Spring - Damper - Mass System in series
fixed-----Spring-----Damper-----Mass----->F
c d m
--> -->
x1 x2
I need help setting up the equations, I know it...