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If \( x^2 + y^2 + 2gx + 2fy + 1 = 0 \) represents a pair of straight lines, then \( f^2 + g^2 \) is equal to
If \( x^2 + y^2 + 2gx + 2fy + 1 = 0 \) represents a pair of straight lines, then \( f^2 + g^2 \) is equal to
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Memorize condition: circle becomes pair of lines when \(g^2+f^2=c\).
Updated On: May 1, 2026
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The Correct Option is B
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