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What are the equations of the directrices of the ellipse 25 x^2+16 y^2=400 ?

Options

  1. A3 x 25=0
  2. B3 y 25=0
  3. Cx 15=0
  4. Dy 25=0

Correct answer

D. y 25=0

Step-by-step solution

25 x^2 400 + 16 y^2 400 =1 gathered or x^2 16 + y^2 25 =1 a^2=16, b^2=25 gathered Eqs. of directrices are y 25=0

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