Solution

directrix

Solution

Solution steps
Rewrite in the standard form:
Parabola is symmetric around the y-axis and so the directrix is a line parallel to the x-axis, a distance from the center y-coordinate
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Popular Examples

foci ((x-4)^2}{36}-\frac{(y-2)^2)/9 =1vertices x^2=4y-2y^2x=(y-5)^2(x-2)^2=12(y+3)(y-2)^2=12(x+1)

Frequently Asked Questions (FAQ)

  • What is the directrix x^2-4y=0 ?

    The directrix x^2-4y=0 is y=-1