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Mathalina S.

asked • 10/10/16

Find the side lengths x and y of the largest area where L is a given length for the diagonal. At the critical point, y=? x=? A=?

It says to eliminate one variable so I eliminated x.
 
A=xy
L2=x2+y2
x=(L2-y2)1/2
 
A=y*(L2-y2)1/2
 
  =(L2y2-y4)1/2
Derivative =1/2(L2y2-y4)-1/2 *L22y-4y3
 
I don't know where to go from here

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