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

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

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

The equation of the directrice of the ellipse 16x ^(2) + 25 y ^(2)= 400 are

The equation of the directrice of the ellipse 16x ^(2) + 25 y ^(2)= 400 are

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

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

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

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

The equations of the directrices of the ellipse 3 x^(2)+4 y^(2)+6 x-8 y-5=0 are