Need more info: which one is the height? which is the lenght and which is width? and what type of prism is it?
To solve this problem you must apply the proccedure shown below:
1- Solve the substraction in the parenthesis and square it:

2- Apply the distributive property and solve the addition:

The answer is: 
Answer:
3rd Choice
Step-by-step explanation:
The third answer choice is correct, remember that a shape is not a rectangle or square if it doesn't have four 90 degree angles.