



 
Hi David, What you have done so far is good but you have some slips in the algebra. You have x^{2}+4y^{2}4=0 and solve for y to get
I added parentheses to make sure what is under the root sign. Then you substitute this value for y into the area function to get
This gives
To complete the problem you need to set f '(x) = 0 and solve for x. Setting f '(x) = 0 gives
If you now multiply both sides by sqrt(x^{2}  4) you get
Solve for x. Penny  


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