Answer:
D. All the choices are correct
I think that's the right answer, if it isn't than my bad!!
Answer:
The polynomial function is 
Step-by-step explanation:
A polynomial has roots
such that
.
In this problem:
The roots are
and 
Then

The polynomial function is 
<span>2x(3x + 2y)
=6x^2 + 4xy</span>
Hi,
Let assume a the west side,
b the length of the north wall (i suppose the answer is smaller then the barn.
Cost of the fence= a*6+a*12+b*12=3000 $.
So 3a+2b=500==>b=(500-3a)/2
Area =a*b=a(500-3a)/2= 250a-3/2a²
Derivate the area ==> 250-3a=0
==> a=250/3 and b=(500-3*250/3)/2=125
Width=125 (feet)
Length=250/3=83.333 (feet)