Q 2389278117.     Under what condition does the equation
`x^2 + y^2 + z^2 + 2ux + 21 vy + 2wz + d = 0` represent
a real sphere'?

NDA 2009 Paper 1 April
A

`u^2 + v^2 + w^2 = d^2`

B

`u^2 + v^2 + w^2 > d`

C

`u^2 + v^2 + w^2 < d`

D

`u^2 + v^2 + w^2 < d^2`

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