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118 Function app
Analyzing functions
The Function menu ( ) in Plot view enables you to
find roots, intersections, slopes, signed areas, and
extrema for any function defined in the Function app. If
you have more than one function plotted, you may need
to choose the function of interest beforehand.
Display the
Plot view
menu
The Function menu is a sub-menu of the Plot view menu.
First, display the Plot view menu:
P
To find a root of the
quadratic function
Suppose you want to find the root of the quadratic
equation defined 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 find 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.
3. Tap
and
select Root
The root is
displayed at the
bottom of the
screen.
If you now move the
trace cursor close to
x = –1 (the other
place where the
quadratic crosses the x-axis) and select Root again,
the other root is displayed.