Question 1058612

Each side that goes into the ground is x inches long.
Of that, x-4 is above ground.

Amount of wire forming the top, horizontal part is 108-2*x.

So the rectangular area, A, enclosed is:

  A = {{{ (108-2x)(x-4) }}}
      = {{{ 108x-432-2x^2+8x }}}
     = {{{  -2x^2 + 116x - 432 }}}