# How do you simplify #sqrt(20y^5)#?

##### 1 Answer

Sep 18, 2015

#### Explanation:

We know we can only take perfect squares out of the root, so we have to find the square factors in 20 and in

The latter is easy, we know that

20 is more complicated, but not hard. We just need to factor it, i.e.: see every prime integer divisor it has in order.

20 | 2

10 | 2

5 | 5

1 | /

So we know we can take a 2 out.