Determine if the given vector field $\vec{F}$ is conservative or not.
$\vec{F} = (-3y, 12y^2 - 3z^2 - 3x - 3z, -6yz - 3y)$
conservative
not conservative
If $\vec{F}$ is conservative, find all potential functions $f$ for $\vec{F}$ so that $\vec{F} = \nabla f$. (If $\vec{F}$ is not conservative, enter NOT CONSERVATIVE. Use C as an arbitrary constant.)
$f(x, y, z) = $