HP 39gII User Manual page 67

To find the
extremum of the
quadratic
H I N T
The FCN
Variables
Function app
1 1. Move the cursor to the
quadratic equation and
find the extremum of the
quadratic.
\
(to move the tracer to
the quadratic)
=
Select Extremum
The coordinates of the extremum are displayed at the
bottom of the screen.
The ROOT and EXTREMUM functions return one value only
even if the function has more than one root or extremum.
The function finds the value closest to the position of the
cursor. You need to re-locate the cursor to find other roots
or extrema that may exist.
The results of the FCN functions are saved in the following
variables:
Root
•
Isect
•
Slope
•
SignedArea
•
Extremum
•
57