JEE Main 2024
Conic Sections
Ellipse
Medium
Question
Let the tangents at the points and on the ellipse meet at the point . If is the focus of the ellipse on its negative major axis, then is equal to ___________.
Answer: 2
Solution
This problem combines several key concepts of ellipses: identifying its standard form, calculating its foci and eccentricity, understanding the equation of a chord of contact, and applying the focal distance property. Our goal is to find the sum of the squared distances from a specific focus to the points of tangency.
1. Analyze the Ellipse and its Properties
First, let's identify the characteristics of the given ellipse: The equation is .
- Standard Form: Compare this to the standard form of an ellipse (for a vertical major axis) or