# How do you find the vertex of a parabola #f(x) = x^2 - 2x - 3#?

##### 1 Answer

Jul 10, 2015

The vertex of

#### Explanation:

Let

Let

A parabola always admit a minimum or a maximum (= his vertex).

We have a formula to find easily the abscissa of a vertex of a parabola :

Abscissa of vertex of

Then, the vertex of

And

Therefore the vertex of

Because