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Help me slove please

[From: ] [author: ] [Date: 12-04-10] [Hit: ]
......
the sum of the length and width of a rectangle is 80 inches. Find the dimensions for which the area is a maximum. ?


I would need a step by step . please

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The greatest area would be when the rectangle is actually a square.

L + W = 80
L = 40, and W = 40

Area = 40^2 = 1600 square inches

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