Final answer:
To find values of x that produce f(x) close to the x-axis, one must analyze the graph of the function. For a horizontal linear function, all values of x produce the same f(x), whereas for a quadratic function, the vertex of the parabola provides the minimum f(x) value.
Step-by-step explanation:
The question involves understanding the graph of a function and identifying values of x that would produce values of f(x) close to the x-axis. To find the value of x that produces a value of f(x) closest to the x-axis, it's necessary to understand the behavior of the function graph. The function provided seems to be improper, but considering a proper function like f(x) = 20, which is a horizontal line, any value of x between 0 and 20 will give the same f(x) (which is 20), and hence none of them are particularly closer to the x-axis. Conversely, for a quadratic function such as f(x) = x² + 2, we would look for the minimum point of the curve, which occurs at the vertex of the parabola. Without a clear function from the question, we can only infer based on typical analysis of functions like these.