Find Equation of Conic with Vector & Foci - Ellipse

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SUMMARY

The discussion centers on determining the equation of an ellipse given the vector (6, -15) and foci at (6, 10) and (6, -14). The correct approach involves using the standard ellipse equation (x-h)²/a² + (y-k)²/b² = 1, where the center (h, k) is derived from the foci. The values for h and k are established as h = 6 and k = -2, while the distance between the foci indicates that a must be recalculated correctly. The participant expresses confusion about the relationship between the vector and the ellipse equation, indicating a need for clarification on the properties of ellipses.

PREREQUISITES
  • Understanding of conic sections, specifically ellipses
  • Familiarity with the standard form of the ellipse equation
  • Knowledge of the relationship between foci, vertices, and the center of an ellipse
  • Basic vector concepts in geometry
NEXT STEPS
  • Study the properties of ellipses, focusing on the relationship between foci and vertices
  • Learn how to derive the values of a, b, and c in the context of ellipse equations
  • Explore the geometric interpretation of vectors in relation to conic sections
  • Practice solving problems involving the equation of ellipses with varying foci positions
USEFUL FOR

Students studying conic sections, particularly those focusing on ellipses, as well as educators and tutors looking to clarify the concepts of foci and vector relationships in geometry.

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Homework Statement


Given the vector (6,-15) and foci (6,10) (6,-14),
Find the equation of the conic.

Homework Equations



Vector = <6,-15>
(x-h)2/a2 + (y-k)2/b2 = 1

Foci (h+c,k) and (h-c,k)
vertices (h+a,k), (h-a,k)

The Attempt at a Solution


k = 6
h=-2
a=-12
I'm not sure what I'm doing. How do I know that this conic is an ellipse, and not a hyperbola? And how do I find b and c, after finding a?

edit:
How does a vector even relate to the equation of an ellipse?
 
Last edited:
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I assume the point (6, -15) is a point on the ellipse.

The expressions you've written down for the locations of the foci are for when the foci lie on the same horizontal line. In this case, the foci lie on the same vertical line.

Your value for a is wrong.
 

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