HP 39gII User Manual page 65

To find the slope of
the quadratic
function
To find the signed
area between the
two functions
Function app
4. Choose the function whose intersection with the
quadratic function you wish to find.
to select F1(X)
The coordinates of the
intersection point are
displayed at the bottom
of the screen.
Note: if there is more
than one intersection (as
in our example), the
coordinates of the
intersection point closest
to the current cursor
position are displayed.
5. Find the slope of the
quadratic function at the
intersection point.
\\
Select Slope
The slope value is displayed at the bottom of the
screen. You can use the left- and right-cursor keys to
trace along the curve and see the slope at other
points. You can also use the up- and down-cursor
keys to jump to another function and see the slope at
points on that graph. Press
the Plot view.
6. To find the area between the two functions in the
range
≤ ≤
– 1.3 x 2.3
and select the signed area option.
= \
or to select the linear
\\\
Select Signed area
to quit and return to
, first move the cursor to F1(X)
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