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Equation of sphere whose centre is at 7...

Equation of sphere whose centre is at `7bari-4barj+bark` and radius `|3bari-2barj+5bark|`, is

A

`vecr^(2) -2vecr.(3bari-2barj+5bark)+28=0`

B

`barr^(2)-2barr.(7bari-4barj+bark)+28=0`

C

`barr^(2)-2barr.(7bari-4barj+bark)-28=0`

D

`barr^(2)-2barr.(3bari-2barj+5bark)-28=0`

Text Solution

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The correct Answer is:
B
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