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For the hyperbola x^2 ^2 - y^2 ^2 =1 , which of the following remains constant when varies?

Options

  1. Aeccentricity
  2. Bdirectrix
  3. Cabscissae of vertices
  4. Dabscissae of foci

Correct answer

D. abscissae of foci

Step-by-step solution

a^2= ^2 and b^2= ^2 Coordinates of focii are ( a e, 0) b^2=a^2 (e^2-1 ) e= . Hence abscissae of foci remain constant when varies.

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