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

##### 1 Answer

Jun 9, 2016

Vertex at:

#### Explanation:

The general explicit vertex form is

for a parabola with vertex at

The given equation:

can be converted into the explicit vertex form as

for a parabola with vertex at

For verification purposes, here is the graph of the original equation:

graph{-x^2+9 [-12.96, 12.35, -2.49, 10.17]}