Find the equations of directrices of the ellipse `25x^2+4y^2=100`.

Find the equations of the directrices of the ellipse x^(2) + 4y^(2) = 4

Find the equation of the directrices of the ellipse x^2/25+y^2/9=1 .

Equation of directrices of the ellipse 5x^2+2y^2=10 , are:

Find the equation of the directrices of the ellipse x^2/36+y^2/16=1

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

Find the eccentricity and the equations of the directrices of the ellipse 7x^(2)+16y^(2)=112 .

Find the centre foci and the equation of the directrices of the ellipse 8x^(2) +9y^(2) - 16x + 18 y - 55 = 0

Equations of directrices of the ellipse x^2/49+y^2/24=1 , are:

The equations of the directrices of the ellipse 25x^(2)+9y^(2)-150x-90y+225=0