how do you draw paraboloid using z=1-x^2-y^2

sorry I haven't taken math for 2 years. I forget how to. I would really appreciated if you can explain me

this is the whole problem

use cylindrical coordinates. Evaluate ∫∫∫E (x^3 +xy^2)dV, where E is the solid in the first octant that lies beneath the paraboloid z= 1-X^2-y^2

I am trying to solve this problem but i feel like I won't know the bound until i know how to draw the paraboloid