To find $f(6)$, locate $x = 6$ on the horizontal axis (x-axis) and identify the corresponding value of $y$ on the vertical axis (y-axis) on the graph. Based on the graph provided:

At $x = 6$, the value of $y$ (or $f(x)$) appears to be -8.

Thus, $f(6) = -8$.

Let me know if you need further explanation or have any questions! Here are five related questions to consider:

1. How would you describe the shape of the function in this graph?
2. How can you find the maximum or minimum point of this function?
3. What is the equation of this quadratic function based on the graph?
4. What happens to $f(x)$ as $x \to \pm \infty$?
5. Can you calculate $f(0)$ using the same method?

Tip: Always check the symmetry of a graph to predict values quickly for certain types of functions!