Graphing x^2+y^2+z^2=z: Integral & Range Help

[kthouz]

can someone help me in graphing the following function: x^2+y^2+z^2=z.
i actually know about x^2+y^2+z^2=k (k=constant) but there above the radius z still changing. the qustion was to intagrate that function and i want to use the spherical coordinates then i will need to know the range of the radius.

 

[AiRAVATA]

Why don't you complete squares?

Hint: (z-z/2)^2=z^2-z+1/4