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6-7 A New Look at
Conic Sections
Objective:
Classify second-degree equations.
Degenerate Conics
Degenerate (adj.):
 having lost the physical, mental, or
moral qualities considered normal
and desirable; showing evidence of
decline.
 lacking some property, order, or
distinctness of structure previously
or usually present, in particular.
6 7 new look at conics
General Form
Ax2 + Bxy + Cy2 +Dx +Ey + F = 0
(where A, B, and C are not all 0)
The Discriminant
If B2  4AC is:
< 0 and A = C, B = 0  circle
< 0 and A  C  ellipse
= 0  parabola
> 0  hyperbola
(As long as graph is not degenerate.)
Example:
Identify the graph of the
equation x2  2xy + 3y2  1 = 0
More Examples:
4x2 + 4xy  y2 = 16
x2  6xy + 9y2 + x  y  1 = 0

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6 7 new look at conics

  • 1. 6-7 A New Look at Conic Sections Objective: Classify second-degree equations.
  • 2. Degenerate Conics Degenerate (adj.): having lost the physical, mental, or moral qualities considered normal and desirable; showing evidence of decline. lacking some property, order, or distinctness of structure previously or usually present, in particular.
  • 4. General Form Ax2 + Bxy + Cy2 +Dx +Ey + F = 0 (where A, B, and C are not all 0)
  • 5. The Discriminant If B2 4AC is: < 0 and A = C, B = 0 circle < 0 and A C ellipse = 0 parabola > 0 hyperbola (As long as graph is not degenerate.)
  • 6. Example: Identify the graph of the equation x2 2xy + 3y2 1 = 0
  • 7. More Examples: 4x2 + 4xy y2 = 16 x2 6xy + 9y2 + x y 1 = 0