To determine the average rate of change of the function \( f(x) \) over an interval \([a, b]\), you can use the formula:
\[ \text{Average Rate of Change} = \frac{f(b) - f(a)}{b - a} \]
The average rate of change is negative when \( f(b) < f(a) \), meaning that the function is decreasing over that interval.
Since I cannot see an actual image of the graph on which the function is plotted, I can guide you on how to find the interval with a negative average rate of change:
- Identify the coordinates of key points (consecutive endpoints) on the graph where you can apply the average rate of change formula.
- Check the function values, \( f(a) \) and \( f(b) \), at these points.
- Determine if the condition \( f(b) < f(a) \) holds for any chosen intervals.
If you provide the specific points or characteristics of the graph, I can assist you further in identifying the interval where the function has a negative average rate of change.