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**[SOLVED] Optimization Using Differentiation**

I have an assignment in which we are to optimize problems using a given 6-step process. More or less it involves Max/Min differentiation.

On of the problems are as follow;

Enclosing the Largest Area

The owner of the Rancho Los Feliz has 3000 yd of fencing material to enclose the rectangular piece of grazing land along the striaght portion of a river. If fencing is not required along the river, what are the dimensions of the lagrgest area that the he can enclose? What is the area?

I under stand that...

a=xy

p=2x+2y

i understand one of the sides can be added to the other 3 sides, however, i'm not sure how to make this a function.