Here we’ll practice using the second derivative test.

The function has two critical points. If we call these critical points and , and order them such that , then

is

, so is a local .

is

, so is a local .
The function has two critical points. If we call these critical points and , and order them such that , then

is

, so is a local .

is

, so is a local .
Consider the function .

What is the domain of ? Domain:

has only one critical point, .

is

, so is a local .
The function has two critical points. If we call these critical points and , and order them such that , then

At , the second derivative test

At , the second derivative test

The function has only one critical point, .

At , the second derivative test