Answer: 
Step-by-step explanation:
Remember that:

![\sqrt[n]{a^n}=a](https://tex.z-dn.net/?f=%5Csqrt%5Bn%5D%7Ba%5En%7D%3Da)
Given the following expression:

The steps to simplify this expression, are:
1. Apply the Distributive property:

2.Since:

You can rewrite the radicand 12 in this form:

3. Simplifying, you get:

4. Notice that the indices of the Radicals are the same, but the radicands don't, then, you can subtract the Radicals.