The directrix of a parabola is the line y=-2 and the focus is (2,-4). This parabola can be written in y=ax^2+bx+c form. Complete the table to determine the values of a, b, and c for the parabola.

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This calculator will find either the equation of the parabola from the given ... latus rectum, focus, vertex, directrix, focal parameter, x-intercepts, y-intercepts of ... Assume that the equation of the parabola is $$y=a x^{2} + b x + c$$. ... Since the parabola passes through the point $$\left(2, 9\right)$$, then $$9=4 a + 2 b + ...