What is the directrix x^2-4x+2 ?

The directrix x^2-4x+2 is y=-9/4

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directrix x^2-4x+2

directrix

x^{2} - 4 x + 2

y = - \frac{9}{4}

Solution steps

Rewrite

y = x^{2} - 4 x + 2

in the standard form

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

(h, k) = (2, - 2), p = \frac{1}{4}

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

(2, - 2)

y-coordinate

y = - 2 - p

y = - 2 - \frac{1}{4}

Refine

y = - \frac{9}{4}

x^{2} - 4 x + 3

y = 3 x - 3 x^{2}

x^{2} - 4 x + 1

y = - x^{2} - 6 x - 13

y = + x^{2} + 5