Manipulate the expression in Column A so that it resembles the expression in Column B.
Distribute the denominator to each term in the numerator, then cancel common terms:

There's no need to calculate either quantity. Given an area of 12,000 square feet, the
shortest possible rectangular perimeter is achieved with a square, in which all sides are the same length.
Column B describes a corral with a width of 300 feet and a length of 400 feet. This corral would require
more fence posts than a square corral.