# How do you find the vertex of a parabola #y=x^2 - 9x#?

##### 2 Answers

Jul 18, 2015

The vertex is at

#### Explanation:

The standard form of the equation for a parabola is

The

To find the

The vertex is at (

graph{y = x^2-9x [-10, 20, -25, 25]}

Jul 22, 2015

Another way of graphing can be as explained below.

#### Explanation:

After writing the quadratic equation in vertex form y=