Math
posted by Breanna on .
Suppose a farmer has 120 feet of fencing to make a rectangular barnyard enclosure. If the enclosure is x feet long, express the area A of the enclosure as a function of the length x. Briefly explain.

if length is x, then width is (1202x)/2
Area is then length x width or
x * (60x) 
A(x) = 60x – x2
A(x) = 120x – x2
A(x) = x2 – 30x
Are any of these the answers? 
The 2 meaning squared of course so
A(x) = 60x – x^2
A(x) = 120x – x^2
A(x) = x^2 – 30x 
x(60x)=60xx^2

So A is the answer then?
A(x) = 60x – x^2
This was my first guess, was I correct? 
what is the square root of negtive 80

I do not know. Does this have anything to do with my problem?