The Function Editor App

How do I calculate a definite integral on a graph?

To calculate a definite integral on a graph, follow these steps.

Determine the definite integral for the function
\( y = \frac{x^2}{8} + x + 1 \) on the interval 0 to 8.

1. Press b Ÿ and select option 7:∫f(x)dx(

2. Press the number and arrow keys to enter the bounds and then press the arrow right › to fill in the function and variable of integration.

3. Press = to evaluate. The value returned is a numeric approximation for the definite integral of the function on the interval given.