Question 44480
The surface area A of a right circular cylinder is A=2Pi times the radius square + 2Pi times the radius times the height and "h" is the height. Find the radius of a right circular cylinder whose surface area is 96.3Pi square inches and whose height is 11.7 inches.

A=2pir^2+2pirh

96.3pi=2pi(r^2+11.7r)
48.15=r^2+11.7r
100r^2+1170r-4815=0
*[invoke quadratic "r",100,1170,-4815]
Hope this helps
Cheers,
Stan H.