How To Find The Directrix?

How do you find the Directrix of a parabola?

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?

How to find the focus and directrix of a parabola –

How do you find the Directrix of an ellipse?

Vertex axis focus directrix of an ellipse (KristaKingMath) –

How do you find the equation of the vertex and Directrix?

Finding Equation of Parabola Given Vertex and Directrix –