Discriminant of a quadratic equation in 2 variables

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Discussion Overview

The discussion revolves around the calculation and definition of the discriminant for a general quadratic equation in two variables, specifically in the form ax² + by² + 2gx + 2fy + 2hxy + c = 0. Participants explore various definitions and implications of the discriminant in this context.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant seeks guidance on how to calculate the discriminant for the given quadratic equation.
  • Another participant notes the absence of a standard definition for the discriminant of polynomials in two variables in textbooks.
  • A participant shares a specific formula for the discriminant from their text and expresses interest in understanding its derivation and significance.
  • Another participant questions the title of the text referenced and provides a link to an alternative formula for the discriminant from Wolfram, indicating a potential discrepancy in definitions.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the definition or calculation of the discriminant for quadratic equations in two variables, with multiple viewpoints and formulas presented.

Contextual Notes

There are limitations regarding the definitions provided, as well as the potential for differing interpretations of the discriminant in various texts and resources.

Ashu2912
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Can anyone tell me how to calculate the discriminant of a general equation of 2 degree in 2 variables, ax[itex]^{2}[/itex]+by[itex]^{2}[/itex]+2gx+2fy+2hxy+c=0? Thanks!
 
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I've never seen a textbook that defined the descriminant for a polynomial of two variables. How do your materials define it?
 
In my text it is defined as abc+2gfh-a(f sq.)-b(g sq.)-c(h sq.). I just want to know how is it derived and what is it's significance and implication...
 

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