SOLUTION: Surface area for right circular cylinder where the surface area is given: 150 = 2(pi)(r)^2 + 180/r 180/r is the height find the radius

If you want to solve the equation


    150 =  + ,


the methods of the school Algebra are not enough.


You should write this equation in numerical form using pi = 3.14,


and then use either graphical method or numerical methods.



For numerical methods, you can use Excel in your computer, for example; 

or, which is simpler, go to one of many specialized web-sites having (free of charge) numerical solvers.


For example, go to  web-site  
    https://www.wolframalpha.com/widgets/view.jsp?id=a7d8ae4569120b5bec12e7b6e9648b86 
print your equation there and press the "SUBMIT" button.


You will get the answer  x= 1.2899.