# What are the critical values, if any, of #f(x)=(x^2-3) / (x+3)#?

##### 1 Answer

Dec 3, 2015

They are

#### Explanation:

By the Quotient Rule, the derivative is

This equals zero when

These are the critical values of

You can check, with the First or Second Derivative Test, that

Here's the graph of

graph{(x^2-3)/(x+3) [-80, 80, -40, 40]}