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Popular >

directrix x^2+2x

Solution

directrix

x^{2} + 2 x

Solution

y = - \frac{5}{4}

Solution steps

Rewrite

y = x^{2} + 2 x

in the standard form

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

(h, k) = (- 1, - 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

(- 1, - 1)

y-coordinate

y = - 1 - p

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

Refine

y = - \frac{5}{4}

Popular Examples

directrix y=x^2-8x+10 directrix

y = x^{2} - 8 x + 10

directrix y=x^2+12x+45 directrix

y = x^{2} + 12 x + 45

directrix y=(5x-8)^2 directrix

y = (5 x - 8)^{2}

directrix y=5x^2+6x-7 directrix

y = 5 x^{2} + 6 x - 7

directrix (x-1)^2=-6(y+4)directrix

(x - 1)^{2} = - 6 (y + 4)

Frequently Asked Questions (FAQ)

What is the directrix x^2+2x ?
The directrix x^2+2x is y=-5/4