Find the exact global maximum and minimum values of the function.
f(x)=x+?x??16?? for 0" style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; line-height: inherit; font-family: inherit; font-size: 14px; vertical-align: baseline;">x>0
If there is no global minimum or maximum, enter "NA."
The global minimum is ___?___.
The global maximum is ___?___.