Answer and explain your reasoning !

This formula will be useful in helping us factor this.



This is the equation that we are going to factor.
Let's first change this equation to have the form 

In order to do that, here are two important exponent rules that was used.



With those rules, we can change the equation into the following:


Refer back to the formula I showed in the beginning of this answer.




Thus, your answer is the first choice. Hope this helps! :)