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A rectangular field, one of whose sides is the straight edge of a river is to be enclosed by 600 metres of fencing on the remaining three sides. what would be the length and breadth of the rectangle if encloased area is to be as large as possible. please answer the above problem as soon as possible. A rectangular field, one of whose sides is the straight edge of a river is to be enclosed by 600 metres of fencing on the remaining three sides. what would be the length and breadth of the rectangle if encloased area is to be as large as possible. please answer the above problem as soon as possible.
All right.So if l is length,b is breadth(or vice versa) then according to the problem2l+b=600.Or,b=600-2lArea A=bl=(600-2l)l=600l-2l2For maxima or minimadA/dl=0Or,600-4l=0Or,l=150So b=300For maxima d2A/dl2Now d2A/dl2=-4please approve if helped.
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