Based on the provided graph of the polynomial function, we need to identify an interval that definitely contains an inflection point. An inflection point is where the concavity of the function changes, i.e., where the curve changes from being concave up (bowl-shaped upward) to concave down (bowl-shaped downward), or vice versa.

Looking at the graph:

1. The curve is concave down between approximately $x = -8$ to $x = -4$, as it is forming a "hill" shape.
2. The curve appears to shift concavity around $x = -2$, since the graph starts to change from concave down to concave up as it moves towards a "valley."
3. Therefore, the interval that contains the inflection point is likely around $(-4, 0)$, where the shape starts to flatten and shift from concave down to concave up.

So, the interval that definitely contains the inflection point is approximately $(-4, 0)$.

Would you like more details on this, or do you have any further questions?

Here are five related questions for further exploration:

1. How can we determine the exact inflection point from the second derivative of the polynomial?
2. Can we find more than one inflection point in higher-degree polynomials?
3. How does the behavior of concavity affect the maximum and minimum points of the graph?
4. What is the relationship between inflection points and critical points in a function?
5. How can we estimate concavity intervals without a graph using just the first and second derivatives?

Tip: The second derivative of a function helps you identify concavity. Where the second derivative changes sign, an inflection point occurs.