1. The problem statement, all variables and given/known data Find an equation of the sphere with center (1,-4,3); with radius 5. What is the intersection of this sphere with the xz-plane? 3. The attempt at a solution I am not sure what the second part of the equations is asking about, but the equation of the sphere is (x-1)^2 + (y+4)^2 + (z-3)^2 = 5^2. Any help on what the second part is about.