Manual

122 Function app
Shortcut : When the Goto option is available, you can
display the Go To screen simply by typing a number. The
number you type appears on the entry line. Just tap
to accept it.
To find the
extremum of the
quadratic
1. To calculate the
coordinates of the
extremum of the
quadratic equation,
move the tracing
cursor near the
extremum of interest
(if necessary), tap
and select
Extremum.
The coordinates of the extremum are displayed at the
bottom of the screen.
Note The ROOT, INTERSECTION, and EXTREMUM operations
return only one value even if the function in question has
more than one root, intersection, or extremum. The app
will only return values that are closest to the cursor. You
will need to move the cursor closer to other roots,
intersections, or extrema if you want the app to calculate
values for those.
The Function Variables
The result of each numerical analysis in the Function app
is assigned to a variable. These variables are named:
• Root
• Isect (for Intersection)
• Slope
• SignedArea
• Extremum
The result of each new analysis overwrites the previous
result. For example, if you find the second root of a
quadratic equation after finding the first, the value of
Root changes form the first to the second root.