The area of a rectangular athletic field is represented by the expression 81y^2-16z^2 square meters. Write an algebraic expression to represent one possible set of dimensions(in the sense " length times width") of the athletic field. Include correct units with your solution.

Answer 1

all you need is a set of factors of the expression

how about
81y^2 - 16z^2 = (9y+4z)(9y-4z)

make one the length, the other the width.