Question 1114658
2x-9 and x, the dimensions


{{{x(2x-9)=180}}}
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{{{2x^2-9x-180=0}}}

discriminant, {{{81+4*2*180=81+4*360=1521}}}, which is  {{{39^2}}}.


{{{highlight_green(x=(9+39)/4)}}}
You can finish the rest...