A farmer needs to enclose two adjacent rectangular pastures. How much fencing does the farmer need?

1 answer:

3 0

W=width of the pasture, and
320000/w=length (parallel to river) 
F=twice width + length 
=2w + 320000/w 

Find derivative of F with respect to w and equate to zero to find w. 
i.e. 
Solve for w in 
dF/dw=0
hope it helps

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