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

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

B

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

C

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

D

(d) `g^(2)-f^(2)=0`

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The correct Answer is:

C

NA

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