Vertex (0, 0); focus (3, 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 (3, 0), a = 3

Thus, the equation of the parabola is y² = 4 × 3 × x,

=> y² = 12x