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## Answers

The Brainliest Answer!

Consider Origin, O, of the space to be centre of the sphere of radius r.

Let point P(x,y,z) be a point inside or on the sphere.

Then, you'll have

.

More generally if C(u,v,w) is the centre

Hence any second degree equation in three variables of sort

represents a sphere of centre C(-u,-v,-w) and radius, .