i just have issues with the algebra, i can take the derivative, but then im stuck. thanks for any help in advance!

An electric current, https://instruct.math.lsa.umich.edu/...f4c6516231.png, in amps, is given by where https://instruct.math.lsa.umich.edu/...bcb72f7071.png is a constant. What are the maximum and minimum values of I?