Suppose you want to graph the second derivative of the following function:

\[ f(x) = x^2 + 3x + 1 \]

1. Create a new document and select Add Graphs.
2. Write f1(x) as the function you want to study.
3. Write f2(x) = \frac{d^2 f1(x)}{dx^2}. To do this: press and select .

   

The function f2(x) is the graph of \( f''(x) \). You can determine when \( f''(x) < 0 \) or \( f''(x) > 0 \) by looking at its graph.