# How do you find the vertex and intercepts for #y=(-x-1)(x+7)#?

##### 1 Answer

vertex at:

#### Explanation:

Given

The **y-intercept** is the value of

Substituting

The y-intercept is at

The **x-intercepts** are the values of

The x-intercepts are at

The **vertex** can be determined in a couple ways:

1. by converting the given equation into *vertex form* (ask if you need to see this version)

or

2. by noting that the axis of symmetry will cross the X-axis a t he mid point between the 2 x-intercepts;

namely at

Substituting

So the vertex is at