what do you know about derivatives? ... i.e., what they can tell you about the behavior of a function.
The endpoints are
The derivative is
(use the Quotient rule).
Set this equal to 0 and solve for x.
Substitute these values back into f(x) to determine their corresponding y-values.
So the absolute maximum is 15 which occurs at x = 3, and the absolute minumum is -12 and occurs at x = .