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[itex]\rho(r)=\frac{5Q}{\pi R^{5}}r(r-R)[/itex]

and [itex]\rho = 0 [/itex] at r bigger or equal to R, how do I find the electrostatic potential of this overall space? There is a charge Q, in addition, at the origin.

My original thought was to just do the usual and use

[itex]V(r)=\frac{1}{4\pi\epsilon_{0}}\int \frac{\rho(r')}{r}dt'[/itex],

which if I am correct the integration goes from 0 to R, correct. Or does it extend from infinity in to R? This has never made much sense to me. Somebody help me out with this idea. Thanks!