A farmer divides a rectangular piece of land into 8 equal-sized rectangular sheep pens as shown in

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A farmer divides a rectangular piece of land into 8 equal-sized rectangular sheep pens as shown in the diagram.
Each sheep pen measures xm by ym and is fully enclosed by metal fencing. The farmer uses 480m of fencing.

i. Show that the total area of land used for the sheep pens, Am2, is given by A = 384x − 9.6x2.
ii. Given that x and y can vary, find the dimensions of each sheep pen for which the value of A is a maximum. 

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