SOLUTION: A homeowner wants to fence a rectangular garden using 80 feet of fencing. The side of the garage will be used as one side of the rectangle. Find the dimension for which the area of

Algebra ->  Surface-area -> SOLUTION: A homeowner wants to fence a rectangular garden using 80 feet of fencing. The side of the garage will be used as one side of the rectangle. Find the dimension for which the area of      Log On


   



Question 819860: A homeowner wants to fence a rectangular garden using 80 feet of fencing. The side of the garage will be used as one side of the rectangle. Find the dimension for which the area of the garden is a maximum.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 
Hi,
A homeowner wants to fence a rectangular garden using 80 feet of fencing.
The side of the garage will be used as one side green%28L%29 of the rectangle.
L + 2w = 80ft 0r L = (80ft-2w)
Find the dimension for which the area of the garden is a maximum.
A+=+w%2880-2w%29+=+-2w%5E2+%2B+80w+=+-2%28x-20%29%5E2+%2B+800+ |Completing the Square
A = -2(x-20)^2 + 800 , function describes a parabola opening downward V(20,80)
area of the garden is a maximum when: w = 20ft and L = 40ft L+=+%2880ft-2w%29