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A farmer has 400 feet of fencing and wants to enclose a rectangular pasture. One side of the pasture is along a river and does not need fencing. What should the deminsions of the rectangular pasture be, so as to maximize the enclosed area?if on
I have it as x+2L=400
Solve for L= -.5x+200
A= x*L
A=-.5X^2+200X
dA=-x+200 x=200
thus the maximum area is 200*100
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because if I plug it back into A it gives me a positive number?

good. you do the first deriv test.

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