Question

The differential equation of (x-a)^{2}+(y-b)^{2}+z^{2}=21. A)z^2(p^2+q^2)=1. B)z^2(p^2+q^2)=21. C))z^2(p^2+q^2+1)=1. D))z^2(p^2+q^2+1)=21.

Answer 1

B)z^2(p^2+q^2)=21.