A.
We can rewrite the squared in two ways.
The first way is to rewrite it as a multiplication, this is:
The second way to rewrite the squared is by using the formula for this kind of product:
B.
Once again we can find the final result using each of the options given in part A, for the first option we have:
For the second option we have:
No matter which way we choose the answer for the squared is: