Question 1114777
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If you simply want to get the written solution from me with the filled blanks, ready for you to submit it further without thinking on it, 
then you are not my student.


But if you want to learn how to solve such problems on your own, then specially for you there is the lesson in this site 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/quadratic/lessons/A-farmer-planning-to-fence-a-rectangular-area-along-the-river--to-enclose-the-maximal-area.lesson>A farmer planning to fence a rectangular area along the river to enclose the maximal area</A>