(1 point) Answer the following questions about the sphere whose equation is given by x2+y2+z2−4x+4y=73. x2+y2+z2−4x+4y=73. 1. Find the radius of the sphere. Radius: r=r= 2. Find the center of the sphere. Write the center as a point (a, b,c)(a, b,c) where aa, bb, and cc are numbers.
Answers: 2
can be written in the form of 
, since then its radius R and center of coordinates C=(a,b,c) would be easily recognizable.
and 
, and we would need to take care of the extra +4 by substracting then. More explicitly:
, as we had originally with the x terms
, as we had originally with the y terms
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