The equation represents a sphere

MATHEMATICS · Single correct · CBSE · Mathematics · Conic Sections · Conic Sections

Problem

The equation x2+y2+z2+4x−6y+2z+9=0x^2+y^2+z^2+4x-6y+2z+9=0 represents a sphere. What are the coordinates of its centre? (a) (−4,6,−2)(-4,6,-2) (b) (2,−3,1)(2,-3,1) (c) (−2,3,−1)(-2,3,-1) (d) (−2,3,1)(-2,3,1)

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