Electrical potential inside a sphere using integration

[PANTS187]

Homework Statement

Find the electrical potential inside a spherical shell carrying a
total charge Q by integrating over the surface.

Homework Equations

E=k q/r^2

The Attempt at a Solution

I know the answer is zero from Gauss's law, but I don't know how to do the integration to get it.

 

[BiGyElLoWhAt]

Do you want to use gauss' law or coulombs law? What integration are you asking about?
This also might be more of a math problem.