<u>ANSWER</u>

<u>EXPLANATION</u>
The given expression is

Recall that:

We use the law of exponents to get

Let us multiply in the exponents to get:

Recall again that:

This implies that:

We expand the power to get:


We multiply out to get:

Answer:
21+3x
Step-by-step explanation:
multiply the 3 by everything inside the parentheses