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Since the vertex is at the origin and the parabola opens downward, the equation of the parabola is x2 = 4py, where p < 0, and the axis of symmetry is the y-axis. So the focus is at y-axis at (0, p) and the directrix equation is y = -p.

Now, what do you mean with 1 and 76 units? 1.76 units?

If the distance of the vertex and the focus is 1.76 units, then p = -1.76, thus 4p = -7.04, then the equation of the parabola is x2 = -7.04y.

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Q: What is the standard equation for vertex at origin opens down 1 and 76 units between the vertex and focus?
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