The base is x.
The height is 5 feet more than the base, so it's x+5.
The area of a parallelogram is the product of its base and its height. The area is 204 square feet.

The length of the base of a parallelogram must be a positive number, so x=12.

The base is 12 feet long, the height is 17 feet long.
Just multiply them together and get a4-2a2-24.
(a2-6)(a2+4)
F: a4
O:4a2
I:-6a2
L:-24
Add together
a4-2a2-24
I think the answer is A but I could be wrong