You missed the pi there:
It should be:
Given a volume of 1700 cm^3, minimize the surface area of a cylinder.
so, for substitutions:
, which I can put into the S equation to get:
And I think I can simplify the above equation to:
and so is the derivative of this equal to:
I wasn't completely sure if the above equation was right. But continuing on, I would set the derivative equal to 0 and solve for r.
Any help would be greatly appreciated!-I know this is a long post, sorry.