SOLUTION: I need to solve the problem in this link please https://drive.google.com/open?id=0B2SbxAb-ajtfRW00d2NCZWdFSW8

Question 1084031: I need to solve the problem in this link please
https://drive.google.com/open?id=0B2SbxAb-ajtfRW00d2NCZWdFSW8
Answer by ikleyn(52867) (Show Source): You can put this solution on YOUR website!
.

The length of the rectangle is 2x (from -x to +x). It is "horizontal" dimension.


The height of the rectangle is f(x) = . It is "vertical" dimension.


The area of the rectangle is  A(x) =  = .


To find the maximum, take the derivative and equate it to zero:

 = 16 - 12x^2 = 0.

====>   =   ====>  x =  =  = .


You calculate maximal area A(x) by substituting x = .

Plot A(x) =

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