JEE Main · 2019 · 10 Apr 2019 · Shift 1 · Hyperbola

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If a directrix of a hyperbola centered at the origin and passing through the point is and its eccentricity is , then
  1. (A)
  2. (B)✓ Correct
  3. (C)
  4. (D)

Answer: (B)

Solution

Take the hyperbola . Passing through gives . The directrix equals , so , and for a hyperbola . Substituting these in, , which clears to .

JEE Main · 2019 · 10 Apr 2019 · Shift 1 · Single correct option

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