Vertex (0, 0); focus (-2, 0)
Since, the vertex of the parabola is (0, 0) and the focus lies on the positive x-axis, x-axis is the axis of the parabola, while the equation of the parabola is of the form y2=-4ax.
Since, the focus is (-2, 0), a = 2
Thus, the equation of the parabola is y2 = -4 × 2 × x,
=> y2 = -8x
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