Maths-
General
Easy

Question

The equation of ellipse whose distance between the foci is equal to 8 and distance between the directrix is 18, is-

  1. 5x2 – 9y2 = 180    
  2. 9x2 + 5y2 = 180    
  3. x2 + 9y2 =180    
  4. 5x2 + 9y2 = 180    

hintHint:

use the expressions for distances between focii and directrices to find the value of a,e,and b.

The correct answer is: x2 + 9y2 =180



    5x2+9y2=100
    2ae= 8 (distance between focii)
    2a/e=18 (distance between directrix)
    On multiplying both the equations, we get
    4a2= 144
    a2=36
    a=6
    e=8/12=2/3
    b=a√1-e2
    b2= 36(5/9)= 20
    equation of ellipse:
    x2/a2+y2/b2=1
    x2/36+y2/20 = 1
    5x2+9y2=100

    the focii are located at (ae,0) and (-ae,0). the distance between them is (ae-(-ae))= 2ae
    similarly, the directrices are at a/e and -a/e .

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