Find the intervals in which f (x) = 2 log (x - 2) - x2 + 4x + 1 is increasing or decreasing
increasing on (2, 6) decreasing on (6, ∞)
increasing on ( - ∞, 3) decreasing on (3, ∞)
increasing on (2, 3) decreasing on (3, ∞)
increasing on (2, 8) decreasing on (8, ∞)