Question 1059606
Same rectangle?  Dimensions w and L.
Let the side length for the square be x.


{{{system(w=-1+2x,L=3x,wL=36+x^2)}}}


Minor simplification, {{{system(w=2x-1,L=3x,wL=x^2+36)}}}


Substitutions into the area equation:
{{{(2x-1)(3x)=x^2+36}}}
and you can simplify and solve this.