Question

what is the directrix of the parabola y² = 4ax?

Explanation:

Step1: Recall the standard - form property

For the parabola \(y^{2}=4ax\), the directrix is a vertical line.
The general formula for the directrix of the parabola \(y^{2} = 4ax\) is \(x=-a\).

Answer:

\(x = - a\)