1. The problem statement, all variables and given/known data Sketch the surface x+y2+z2+1=0 2. Relevant equations 3. The attempt at a solution I'm not to sure how to proceed with this. My initial idea was to re-arrange for x such that x=-1-y2+z2=-1-r2 thus the equation for the surface becomes y2+z2=r2 I'm not sure what to do next though.