A farmer has 336 ft of fencing and wants to build two identical pens for his prize-winning pigs. The pens will be arranged as shown. Determine the dimensions of a pen that will maximize its area.

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Fencing = 3x + 4y 336 = 3x + 4y Area = 2xy A = 2xy x = (336-4y) / 3 A = 2[(336-4y)/3] y Find dA/dy and equate to 0. solve for y.

I dont understand this part: x = (336-4y) / 3 A = 2[(336-4y)/3] y Find dA/dy and equate to 0. solve for y.

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