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General Second Degree Equation

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Estimated time: 3 minutes
  • The necessary conditions for a general second degree equation
    ax2 + 2hxy + by2 + 2gx + 2fy + c = 0
  1. abc + 2fgh - af2 - bg2 - ch2 = 0
  2. h2 - ab ≥ 0
Maharashtra State Board: Class 12

Definition: General Second Degree Equation

 Equation of the form ax² + 2hxy + by² + 2gx + 2fy + c = 0 is called a general second-degree equation.

  •  The necessary conditions for a general second-degree equation to represent a pair of lines are: (i) abc + 2fgh − af² − bg² − ch² = 0, (ii) h² − ab ≥ 0
Maharashtra State Board: Class 12

Key Points: Nature of Pair of Lines

Condition Type of Lines
\[\Delta=0,h^2>ab\] Intersecting lines
\[\Delta=0,h^2 = ab\] Coincident lines
\[\Delta=0,h^2<ab\] Imaginary lines
(\[\Delta=0,h^2=ab\] and \[bg^{2}=af^{2}\] Parallel lines
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