# Easy divergence theorem problem

Evaluate the flux integral using the Divergence Theorem if F(x,y,z)=2xi+3yj+4zk
and S is the sphere x^2+y^2+z^2=9

so far i took the partial derivitavs of i j k for x y z and added them to get 9.

so i have the triple integral of 9 dzdxdy

i think u have to use polar cordinates, but im reeally bad at those. and do not know how to set the bounds for this problem. can someone help me get started with that? thanks.

If you really do want to integrate, use spherical coordinates. You book probably gives an example of using spherical coordinates to find the volume of a sphere. The "differential of volume" in spherical coordinates is $\rho^2 sin(\phi) d\rho d\theta\dphi$ and the limits of integration are $\rho$ from 0 to 3, $\theta$ from 0 to $2\pi$ and $\phi$ from 0 to $\phi$.