Aparabola has a vertex at the origin. the focus of the parabola is located at (–2,0).
which is the equation for the directrix related to the parabola?
y=2
x=2
y=-2
x=-2

Based on the given, it can be said that the parabola is opening to the left since the focus is located at point (-2,0). Based on the basic property of the parabola, the distance between the vertex and the focus is equal to the distance from the vertex to the point where the directrix passes through. Also, the directrix is always parallel to the latus rectum. Therefore, equation of directrix, x=2

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