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IF the equation x^(2) + y^(2) + 2gx + 2f...

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

A

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

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
C
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