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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) = 0`

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
B
`f^(2) + g^(2) = 1`
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