Question 330594
a=lw  know your formulas
a=72
w=(l/2)-5
{{{72=l((l/2)-5)}}}
{{{72=(l^2/2)-5l}}}
{{{144=l^2-10l}}}
{{{0=l^2-10l-144}}} view below for quadratic explaination
{{{l=18}}} 
72/18=w
{{{w=4}}}
 *[invoke quadratic "l", 1, -10, -144]