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The equations of the directrices of the ...

The equations of the directrices of the ellipse `9x^(2) + 25y^(2) = 225` are

A

`4x=pm5`

B

`16x=pm25`

C

`4x=pm25`

D

`3x=pm25`

Text Solution

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The correct Answer is:
C
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AAKASH SERIES-ELLIPSE-PRACTICE EXERCISE
  1. The length of the latusrectum of ((x-3)^(2))/(16)+(y-2)^(2)/(36)=1 is

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  2. The equation of the minor axis of the ellipse (x-1)^(2)/(9)+(y-6)^(2)/...

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  3. The equations of the directrices of the ellipse 9x^(2) + 25y^(2) = 22...

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  4. The vertices of the ellipse 9x^(2) + 25y^(2) - 90x - 150y + 225 = 0 ar...

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  5. The foci of the ellipse 9x^(2)+ 5(y^(2)-10y +25)=45 are

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  6. The equation of the major axis of 25x^(2) + 16y^(2)-100x - 96y - 156 =...

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  7. The equations of the latus recta of the ellipse 9x^(2) + 25y^(2) - 36x...

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  8. The equations of the directrices of 16x^(2) + 25y^(2) - 96x - 100y - 1...

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  9. The asending order of the eccentricities l(1),l(2),l(3) of the conics...

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  10. Let P be a point on an ellipse whose parameter is (pi)/(3) . The sum a...

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  11. Match the eccentricities of the ellipses The correct Matching is

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  12. Assertion (A) : the sum and product of the slopes of the tangents to...

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  13. If the latusrectum of an ellipse is half of its major axis then e is

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  14. If the latus rectum of an ellipse is half of its minor axis then e =

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  15. The distance between the directrix is equal to 8 times the distance be...

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  16. If the m inor axis of an ellipse form s an equilateral triangle with o...

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  17. Let S, S^(') are the focii and BB^(') be the minor axis of an ellipse....

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  18. The length of the latus rectum of an ellipse is 4. The focus and its c...

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  19. Let P be a point on an ellipse whose parameter is (pi)/(3) . The sum a...

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  20. The latus rectum LL^(') subtends a right angle at the centre of the el...

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