Three Dimensional Geometry Question 20
Question: Equation $ ax^{2}+by^{2}+cz^{2}+2fyz+2gxz+2hxy $ $ +2ux+2vy+2wz+d=0 $ represents a sphere, if
[MP PET 1990]
Options:
A) $ a=b=c $
B) $ f=g=h=0 $
C) $ v=u=w $
D) $ a=b=c $ and $ f=g=h=0 $
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Answer:
Correct Answer: D
Solution:
It is obvious.