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A farmer has 420 feet of fencing to enclose 2 adjacent rectangular pig pens sharing a...

A farmer has 420 feet of fencing to enclose 2 adjacent rectangular pig pens sharing a common side. What dimensions should be used for each pig pen so that the enclosed area will be a maximum? The two adjacent pens have the same dimensions.

Find the absolute maximum value of f(x)= x4−2x

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