# How do you combine #\sqrt { 27} + 3\sqrt { 12} - 9\sqrt { 8}#?

##### 1 Answer

Sep 2, 2017

#### Explanation:

With roots, the best way to approach the simplification is to look for factors that are squares. Let's look at

9 has a square root, so we can pull its root out from under the radical.

So now let's simplify the other roots the same way:

We can combine the two

Last, if you want, you can pull the common factor of 9 out: