# 2.3 Area above and below the x-axis

## Applet explorations

**1)**Your goal in this task is to predict the area enclosed between the function , the x-axis and the lines at A and B. Try doing this by hand first of all. Type your answer into the box and press enter.

**2)**Show the areas for different integrals using the checkboxes. Does this change your prediction? Keep trying until you get the correct number in the answer box.

**3)**Move the sliders to change the limits. Can you come up with a general rule for this kind of problem? Type in new answers to make sure your general rule is correct.

**4)**Extra question: What happens when you move B to the left of A? Why does this happen?

**Summarise any key points at the bottom of the page.**

## Applet conclusions

Note any key points from this activity. How can this applet be used to develop our understanding of calculus?