Respuesta :

mathmate
The equation of a sphere of radius r with centre at (a,b,c) is
(x-a)^2+(y-b)^2+(z-c)^2=r^2
Thus with (a,b,c)=(6,-7,7), the equation of the sphere is
(x-6)^2+(y+7)^2+(z-7)^2=r^2

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