# How do you simplify #(w^2-16)/w * 3/(4-w)#?

##### 1 Answer

Aug 2, 2015

#### Explanation:

The first thing to notice here is that the numerator of the first fraction can be factored as the *difference of two squares*, for which you know that

#color(blue)(a^2 - b^2 = (a+b)(a-b))#

In your case, you will get

Another important thing to notice is that you can factor the denominator of the second fraction by using

Your expression will thus be