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To find an
intersection of the
two functions
Function app
Note the
button. If you tap
this, one or two
dotted lines pick out
the point of interest
(in this case a root).
If, while this button
is active, you tap
elsewhere on the
screen, a set of dotted lines appears on the screen.
The dotted lines intersect the currently selected plot
closest to the point you tapped. Their point of
intersection is a tracing cursor. If you make another
calculation where there is more than one answer, the
answer that applies to the point closest to this tracing
cursor is the answer provided. This is a faster way of
choosing a point of interest than using the trace
cursor. (You can move this tracing cursor using the
cursor keys if you need finer precision.)
Just as there are two roots of the quadratic equation, there
are two points at which both functions intersect. As with
roots, you need to position your cursor closer to the point
you are interested in. In this example, the intersection close
to x = 1 will be determined.
The Go To command is another way of moving the trace
cursor to a particular point.
1. Tap
to re-display the menu, tap
1, and tap
Q
The tracing cursor will now be on one of the
functions at x = 1.
2. Tap
and
select
Intersection.
A list appears
giving you a choice
of functions and
axes.
3. Choose the function
whose point of intersection with the currently selected
function you wish to find.
.
, enter
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