y2 = 4ax y2 = – 4ax
Focus = (a, 0) Focus = (– a, 0)
Equation of the directrix x + a = 0 Eqn. of the directrix x – a = 0
Axis of the parabola y = 0 Axis of the parabola y = 0
Vertex = (0, 0) Vertex = (0, 0)