Equation of directrix is not given Please Give - Maths - Conic Sections

Question

Equation of directrix is not given ? Please Give

Ankush Jain · Accepted Answer

The general equation of the ellipse is:

$\frac{x^{2}}{a^{2}} + \frac{y^{2}}{b^{2}} = 1$

1) If a > b, then equation of directrix is:

$x = \frac{a}{e} a n d x = \frac{- a}{e}$

2) If a < b, then equation of directrix is:

$y = \frac{b}{e} a n d y = \frac{- b}{e}$

Equation of directrix is not given ? Please Give .