Find Where f(x) < 0: Analyzing Function Values Between x = 1 and x = 7

To solve the problem of determining where $f(x) < 0$:

• Step 1: Identify the x-intercepts of the graph, which are $x = 1$ and $x = 7$.
• Step 2: Examine the section of the graph between these intercepts. Since the graph dips below the x-axis between these values, $f(x) < 0$ in that interval.

Therefore, the function is negative between the roots, i.e., $1 < x < 7$.

Thus, the solution to the problem is: $1 < x < 7$.