How To Find Directrix Of Parabola?

How do you find the Directrix?

The standard form is (x – h)2 = 4p (y – k), where the focus is (h, k + p) and the directrix is y = k – p.

If the parabola is rotated so that its vertex is (h,k) and its axis of symmetry is parallel to the x-axis, it has an equation of (y – k)2 = 4p (x – h), where the focus is (h + p, k) and the directrix is x = h – p.

How do you find the focus and directrix of a parabola?

How to find the focus and directrix of a parabola –

How do you find the Directrix of a hyperbola?

Vertex axis focus directrix asymptotes of a hyperbola –

How do you find the P of a parabola?

The absolute value of p is the distance between the vertex and the focus and the distance between the vertex and the directrix. (The sign on p tells me which way the parabola faces.) Since the focus and directrix are two units apart, then this distance has to be one unit, so | p | = 1.