1. ## Completing the Square: Center and Radius

Thank for the help.

2. Hi,

Just bring the 4 from Left Hand Side to the right
The term on RHS is the square of radius
ie; $\sqrt{\frac{21}{4}}$ is the radius
and the center coordinates are (1,-2,0)..

Hi,

ie; $\sqrt{\frac{21}{4}}$ is the radius