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If the equation x^(2)+y^(2)+2gx+2fy+1=0 ...

If the equation `x^(2)+y^(2)+2gx+2fy+1=0` represents a pair of lines then

A

`f^(2)-g^(2)=1`

B

`f^(2)+g^(2)=1`

C

`g^(2)-f^(2)=1`

D

`f^(2)+g^(2)=(1)/(2)`

Text Solution

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The correct Answer is:
B
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