HP 39g+ - Manual (Page 64)

3-4 Function aplet
To find the
greater of the two
roots of the
quadratic
function 10. Find the greater of the two roots of the quadratic
function.
Note: Move the cursor to the graph of the quadratic
equation by pressing the
*k, or *e, key. Then move the
cursor so that it is near by pressing the
*A, or
*>, key.
A8I—Ã Select à Root Ã
PF—
The root value is
displayed at the bottom
of the screen.
To find the
intersection of
the two functions 11. Find the intersection of the two functions.
H@IV—ÃA8I—
*e,
PF—
12. Choose the linear function whose intersection with the
quadratic function you wish to find.
PF—
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.
x 1 – =