1. The problem is to deduce a property or value graphically from the function $f$. 2. To solve this, we first need the explicit form of the function $f(x)$ or its graph. 3. Graphical deduction involves analyzing the graph's key features such as intercepts, maxima, minima, and points of inflection. 4. Without the explicit function or graph, we cannot proceed with graphical deduction. 5. Please provide the function $f(x)$ or its graph to continue with the graphical deduction.