
You can also perform a 2-nger pinch zoom horizontally to dilate the graph.
Several indicators help you record the transformations made to the graph:
●
Light blue rectangles record the last few transformations, and a dark blue triangle indicates the
current transformation.
●
All aected parameters are underlined in blue. A dotted blue underline indicates previous
transformations, and a dark blue underline indicates the current transformation.
●
A transparent version of the original graph is displayed in the background.
After you perform a transformation, the button is displayed. Tap the button to select an
alternate form for the function
denition. The forms available depend on the selected denition.
If you tap and change the form of the denition, the button is displayed. Tap this
button to simplify the selected
denition. It also rounds the parameter values to one or two decimal
places.
4.
Tap to save your changes.
5.
If you need to edit the expression further, tap the expression or tap . Enter the exact
expression.
6.
Tap to save your changes.
7.
Tap or to close the editor.
Finding a root of a quadratic equation
Suppose you want to nd the root of the quadratic equation dened earlier. Since a quadratic equation can
have more than one root, you will need to move the cursor closer to the root you are interested in than to any
other root. In this example, you will nd the root of the quadratic close to where x = 3.
1. If it is not already selected, select the quadratic equation:
or
2.
Press or to move the cursor near to where x = 3.
120 Chapter 7 Function app
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