What is the directrix y=(x-4)(x-2) ?

The directrix y=(x-4)(x-2) is y=-5/4

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directrix y=(x-4)(x-2)

directrix

y = (x - 4) (x - 2)

y = - \frac{5}{4}

Solution steps

Rewrite

y = (x - 4) (x - 2)

in the standard form

4 \cdot \frac{1}{4} (y - (- 1)) = (x - 3)^{2}

(h, k) = (3, - 1), 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

(3, - 1)

y-coordinate

y = - 1 - p

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

Refine

y = - \frac{5}{4}