We paint with:
• red the regions where the function is decreasing,
,
• green the regions where the function is increasing.
From the graph, we see that the function is:
• decreasing in the intervals (-∞, -1.5) and (2, ∞),
,
• increasing in the interval (-1.5, 2).
Answer
• Increasing on the interval(s): ,(-∞, -1.5), (2, ∞)
,
• Decreasing on the interval(s): ,(-1.5, 2)