What is the directrix-7x^2 ?

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directrix-7x^2

directrix

- 7 x^{2}

y = \frac{1}{28}

Solution steps

Rewrite

y = - 7 x^{2}

in the standard form:

4 (- \frac{1}{28}) (y - 0) = (x - 0)^{2}

(h, k) = (0, 0), p = - \frac{1}{28}

Parabola is symmetric around the y-axis and so the directrix is a line parallel to the x-axis, a distance

- p

from the center

(0, 0)

y-coordinate

y = 0 - p

y = 0 - (- \frac{1}{28})

Refine

y = \frac{1}{28}

x^{2} - x - 2

2 x^{2} + 5 x - 7

10 y^{2} = 22 x

y \geq x^{2}

y = - x^{2}