Question 1185449
<pre>
W = width, L = length, P = perimeter, A = area

{{{ P = 100 = 2L + 2W }}}

Solve for L:
{{{ L = (100 - 2W)/2 = 50-W }}}

Write Area formula and subs for L from above:
{{{ A = L*W = (50-W)*W }}} {{{m^2}}}

or you can write  {{{ A = 50W-W^2 }}} {{{m^2}}}