JEE Advanced · 2010 · 11 Apr 2010 · Paper 2 · Ellipse

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Tangents are drawn from the point P(3, 4) to the ellipse touching the ellipse at points A and B.

The equation of the locus of the point whose distances from the point P and the line AB are equal, is
  1. (A)✓ Correct
  2. (B)
  3. (C)
  4. (D)

Answer: (A)

Solution

The locus of points equidistant from a point (focus) and a line (directrix) is a parabola.

Here, the focus is and the directrix is the line .

For a point on the locus:


Squaring both sides:




JEE Advanced · 2010 · 11 Apr 2010 · Paper 2 · Single correct option

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