Find the Parabola with Vertex f(3,8) and Directrix y=4 (3,8) y=4

Math
Since the directrix is vertical, use the equation of a parabola that opens up or down.
Find the distance from the focus to the vertex.
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The distance from the focus to the vertex and from the vertex to the directrix is . Subtract the value of the directrix from the coordinate of the vertex to find .
Subtract from .
Substitute in the known values for the variables into the equation .
Simplify.
Find the Parabola with Vertex f(3,8) and Directrix y=4 (3,8) y=4


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