Question 348752
2(x+y)=100 , x+y=50 , x=50-y
xy=576
(50-y)y=576
-y^2+50y=576
y^2-50y+576=0
the answer is: 32, 18 see quadratic solver below.
so y is: 18, 32

so for biggest area would be 25 by 25 =625
*[invoke quadratic "y", 1, -50, 576]