a rectangular field is to be enclosed with 240m of fence. let x be the length of the field.express the area of the field as a function of x

Question

a rectangular field is to be enclosed with 240m of fence. let x be the length of the field.express the area of the field as a function of x.

Answer 1

Let 2x +2y = 240 so x + y =120 and y=120-x the area of the rectangular field is A=xy = x(120 -x).