# If #f(x)=x^(-5/7)#, how do you compute f'(3)?

##### 1 Answer

Apr 29, 2018

#### Explanation:

Here, we can use the **Power Rule**

If this looks foreign to you, it's really straightforward:

- The constant comes out front
- The exponent is decremented by
#1#

Doing this, we get

Now, we can plug in

which is approximately equal to

Notice, we only used the Power Rule here, stated above, and we evaluated the expression at

Hope this helps!