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Without using a graphing calculator, determine the maximum and minimum values of the function over the interval .

Candidates for global maxima and global minima exist where the derivative equals AND where the derivative does not exist.... Notice that this is a function that has a closed domain. That means that we already know two candidates for global max and min: the endpoints.

Evaluate the endpoints:

These might be the global min and max, respectively. We still need to check the other candidates.

Find additional candidates by setting the derivative equal to zero, and solving for

and are candidates...
but eliminate because it is not within the given domain.

Evaluate the remaining candidates: and compare to the endpoint candidates.

Recall that maxima and minima are -values.
Therefore the global maximum is and the global minimum is . It should also be noted that is a local maximum.
Confirm this by sketching on your graphing calculator.