An equation of the sphere with center (a,b,c) and radius r is (x-a) 2 + (y-b) 2 + (z-c) 2 = r 2. Put the given equation in this form by completing the square: (x 2 +12x) + (y 2 -18y) + (z
Similarly, you can use the standard form of the sphere equation to find the radius and center of the sphere. For example, a sphere with the equation (x-7)^2 + (y-12)^2 + (z-4)^2 =
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