TI89-14
Chapt er 1
Copyright © Houghton Mifflin Company. All rights reserved.
Thevalueoftheleftmostx-intercept has
the x-coordinate
x
=
−
0.5.
Repeat the above procedure to find the
rightmost x-intercept. Confirm that it is
where
x
= 4.25.
NOTE: If this process does not return the correct value for the intercept that you are trying to
find, you have probably not included the place where the graph crosses the axis between the two
bounds (i.e., between the
and
marks on the graph.)
I NTERSECTI ON METHOD
for solving the equation f(x)=c:
Press
F1 (Y
=
)
and clear all locations with
CLEAR .
Enter
one side of the equation, 3x –0.8x
2
+4,in
y1
and the other side
of the equation, 2.3, in
y2
.
Draw the graphs with
F2 [Zoom] 4 [ZoomDec] or F2 [Zoom] 6
[ZoomStd].
If you use the former, press
F2 (WINDOW)
and
reset
ymax
to
8
to get a better view of the top of the graph.
(If you reset the window,
F3 (GRAPH)
redraws the graph.)
To locate where
y1
=
y2
,press
F5
[Math] 5 [Intersection].
Press
ENTER
to mark the first curve. The cursor
jumps to the other function – here, the
line. Next, press
ENTER
to mark the
second curve.
Note that the number corresponding to the location of each
function appears on the top left of the screen as the cursor moves
from the curve to the line. Next, press
◄
to move the cursor to
the left of the intersection point you want to find – in this case,
the leftmost point. Press
ENTER .
Use
►
to move the cursor to the right of the intersection point
you are finding to supply the upper bound for that point. The
point of intersection must lie between the two markers for the
lower and upper bounds. Press
ENTER .
Thevalueoftheleftmostx-intercept has
the x-coordinate
x
=
−
0.5.
Repeat the above procedure to find the
rightmost x-intercept. Confirm that it is
where
x
= 4.25.
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