Step-by-step explanation:
The function is positive when the graph is over the x-axis, and negative when the graph is under the x-axis.
As we can see from the graph, it has x-intercepts at x = -3 and x = 3.
Since the graph curves upwards, the function is positive in intervals (-∞, -3) U (3, ∞) and negative in the interval (-3, 3).
