Question 673225
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Hi,
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an open rectangular tank with a square base of side x metres and with a volume of 8m³" 
V = {{{x*x*h = 8m^3}}}  h = {{{8/x^2}}}
This is an "Open tank"  where length and width are x:
S = {{{ x*x + 2x*h + 2*x*h}}}
 S ={{{ x^2 + 2x(8/x^2) + 2x(8/x^2) = x^2 + 16/x + 16/x = 32/x}}}