@Carl Love 

this was exactly what i was looking for :D

@Markiyan Hirnyk 

this is the way i would normaly solve this problem. 

but thx for the fast response, i realize i was not making myself very clear. 
im new at math and maple

@tomleslie 

Thx worked like a charm. 

now im at it, i've been unsuccesfull in figuring out how to define a function for limited x values
such that the function is only defined in eksample from before for  0<=x<=2000.
not just crop the graph(like shown below), but restrict the defined function in such a way, that if i ask for eqn(2500) it wil return undefined. hope om not talking too much nonsense.