Suppose you have 56 feet of fencing to enclose a rectangular dog pen. The function A=28x-x^2 , where x = width, gives you the area of the dog pen in square feet. What width gives you the maximum area? What is the maximum area?

for ex: the reciprocal of 3/4 is 4/3. it is the opposite.

reciprocal definition:

a mathematical expression or function so related to another that their product is one; the quantity obtained by dividing the number one by a given quantity.

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