Question

For the standard form of the parabola $y^2=-4ax$, the equation of the directrix is

Answer 1

Directrix of Parabola:

Given $y^2=-4ax$

Here focus is $(-a,0)$.

Equation of directrix is

$x=a$

$\Rightarrow$$x–a=0$

Hence, the required equation of the directrix is $x–a=0$.