# What is the vertex, axis of symmetry, the maximum or minimum value, and the range of parabola #y= -x^2-8x+10#?

##### 2 Answers

The slope of this parabola is

and this slope is equal to zero at the vertex

The vertex happens where

The vertex is at

and has a maximum value of

The axis of symmetry is

(a vertical line through the vertex).

The range of this equation is

Two other ways to find the vertex of a parabola:

**Memorization**

The graph of the equation:

has vertex at

After you use this to find

The value of

**Complete the Square**

Complete the square to write the equation in Vertex Form: