Q:

How do I Simplify a radical expressions

I'm having trouble understanding how to simplify the following radical expression. 
$$\sqrt{3087}$$
Could someone please help me understand how to?

A:

$$\sqrt{3087}=\sqrt{3^2\cdot 7^3}=\sqrt{3^2}\cdot \sqrt{7^2}\cdot \sqrt{7}=3\cdot 7\cdot \sqrt{7}=21\sqrt{7}$$

