Intersection Method - Texas Instruments TI-84 Plus Manual

Press and clear all locations with
Y=
2
tion 3x – 0.8x
2
or enter it with
x
, for the subtraction signs.
(−)
Draw the graph of
If you use the former, press
[ZStandard].
to and
Xmax 6
reset the window, press
To graphically find an x-intercept, i.e., a value of x at which the
graph crosses the horizontal axis, press
Press and hold
2 [zero].
the leftmost x-intercept. Press
the left bound for the x-intercept.
Notice the small arrowhead ( ) that appears above the location
to mark the left bound. Now press and hold
to the right of this x-intercept. Press
location of the right bound for the x-intercept.
For your "guess", press
the graph crosses the horizontal axis. Press
The value of the leftmost x-intercept
has the x-coordinate
Repeat the above procedure to find the
rightmost x-intercept. Confirm that it
occurs 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.)

INTERSECTION METHOD

Press and clear all locations with
Y=
of the equation, 3x – 0.8x
equation, 2.3, in
12
+ 4 – 2.3 in . You can enter x
Y1
. Remember to use
X,T,θ,n ^ 2
with
Y1 ZOOM 4 [Zdecimal] or ZOOM 6
to to get a better view the graph. (If you
Ymax 5
to draw the graph.)
GRAPH
until you are near, but to the left of,
◄
ENTER
ENTER
to move the cursor near to where
◄
−
X = 0.5.
for solving the equation f(x) = c:
2
+ 4 in and the other side of the
Y1
Y2.
Enter the func-
CLEAR .
2
with
X,T,θ,n
, not
−
and reset
WINDOW
2ND TRACE (CALC)
to mark the location of
until you are
►
to mark the
.
ENTER
Enter one side
CLEAR .
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Chapter 1