HP 39g+ Graphing Calculator Guide de l'utilisateur Page 66

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3-4 Function aplet
Analyse graph
with FCN
functions
9. Display the Plot view menu.
From the Plot view menu, you can use the functions
on the FCN menu to find roots, intersections, slopes,
and areas for a function defined in the Function aplet
(and any Function-based aplets). The FCN functions
act on the currently selected graph. See “FCN
functions” on page 3-10 for further information.
To find a root of the
quadratic function
10.Move the cursor to the graph of the quadratic
equation by pressing the or key. Then move
the cursor so that it is near by pressing the
or key.
Select
Root
The root value is
displayed at the
bottom of the screen.
Note: If there is more
than one root (as in our
example), the
coordinates of the root closest to the current cursor
position are displayed.
To find the
intersection of the
two functions
11.Find the intersection of the two functions.
x 1=
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