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5-16.

A function is increasing where its first derivative > 0 and decreasing where its first derivative is < 0.
Find these intervals algebraically.

A function is concave up when its second derivative is > 0 and concave down when its second derivative is < 0.
Find these intervals algebraically.

Notice that x = 2 is a boundary point. Even though f '(2) ≠ 0 and f ''(2) ≠ 0, interesting changes in slope and concavity can still happen at x = 2.