Question

write the formula of eccentricity to find the equation of directrices of horizontal ellipse​

Answer 1

Answer:

To find the eccentricity of an ellipse. This is basically given as e = (1-b2/a2)1/2. Note that if have a given ellipse with the major and minor axes of equal length have an eccentricity of 0 and is therefore a circle.

Answer 2

Answer:

if an ellips has centre (0,0) eccentricity e and semi major axis a in the x direction , then its foci are at (+ae,0) and its directrices are x=+a/e.