The equation ax2 + ay2 + az2 + 2ux + 2vy + 2wz + d = 0, (a ≠ 0) rep – McqOptions

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1.	The equation ax2 + ay2 + az2 + 2ux + 2vy + 2wz + d = 0, (a ≠ 0) represents a sphere if
A.	u2 + v2 + w2 - d ≥ 0
B.	u2 + v2 + w2 - ad ≥ 0
C.	u2 + v2 + w2 - d ≤ 0
D.	u2 + v2 + w2 - ad ≤ 0
Answer» C. u2 + v2 + w2 - d ≤ 0

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