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The equations of the sphere concentric ...

The equations of the sphere concentric with the sphere ` 2x^(2) +2y^(2) +2z^(2) - 6x +2y -4 z =1` and
double its radius is :

A

` x^(2) +y^(2) +z^(2) -x + y - z=1`

B

` x^(2) + y^(2)+ z^(2) -6x +2y -4z =1`

C

` 2x^(2) +2y^(2) +2z^(2) -6x + 2y -4z -15=0`

D

`2x^(2) +2y^(2) +2z^(2) -6x +2y -4z -25=0 `

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The correct Answer is:
D
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