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JEE Main 2023
Conic Sections
Hyperbola
Hard

Question

The vertices of a hyperbola H are (±\pm 6, 0) and its eccentricity is 52{{\sqrt 5 } \over 2}. Let N be the normal to H at a point in the first quadrant and parallel to the line 2x+y=22\sqrt 2 x + y = 2\sqrt 2 . If d is the length of the line segment of N between H and the y-axis then d2^2 is equal to _____________.

Answer: 2

Solution

This problem combines concepts of hyperbolas, including their standard equation, eccentricity, properties of normals, and coordinate geometry principles such as slope and distance. We will systematically break down the problem into clear, manageable steps.


1. Determine the Equation of the Hyperbola H

  • Key Concept: The standard equation of a hyperbola with its transverse axis along the x-axis (vertices on the x-axis) is given by x2a2y2b2=1\frac{x^2}{a^2} - \frac{y^2}{b^2} = 1. The vertices are at (±a,0)(\pm a, 0). The eccentricity ee of a hyperbola is related to aa and bb by the formula $$e^2 = 1 + \

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