Question: Let a = (a1, a2, a3) and b = (b1, b2, b3) be fixed vectors. Show that (x - a) (x - b) =

Let a = (a1, a2, a3) and b = (b1, b2, b3) be fixed vectors. Show that (x - a) ∙ (x - b) = 0 is the equation of a sphere, and find its center and radius.

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