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

directrix-1/8 (y-8)^2+2directrix 2x^2-10directrix y^2=4(-4)xdirectrix (y+1)^2=-4(x-2)directrix 100+6x^2-8x

Frequently Asked Questions (FAQ)

  • What is the directrix (x-4)^2=8(y+2) ?

    The directrix (x-4)^2=8(y+2) is y=-4