How to Find the Focus, Vertex, and Directrix of a Parabola?
How to find the focus, vertex, and directrix of a parabola, step by step: the rule in plain language, solved examples worked one line at a time, and practice questions so you can try it yourself before moving on. You can easily find the focus, vertex, and directrix from the standard form of a parabola.
How to Write the Equation of Parabola?
To write the equation of a parabola in standard form, identify the vertex and one other point, substitute them into the vertex form, solve for the coefficient, and expand. The worked examples below show that sequence for parabolas opening in each direction.