Find absolute extrema on closed regions (using the u’s) A shipping company handl

Question

Find absolute extrema on closed regions (using the u’s)

A shipping company handles rectangular boxes provided the sum of the height and the girth does not exceed 96 inches. ( Girth is the perimeter of the base). Find the dimensions of the box of largest volume that the company will ship.

This is my work. Let me know if i did it right or if not, what i did wrong. Thanks a lot for your help!!!

http://postimg.org/image/k01vjiizt/

http://postimg.org/image/uw2autt0t/

http://postimg.org/image/v1mu3of5f/

Explanation / Answer

extrema on closed region is true.

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