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B-16
TI-85/TI-86 Graphing Calculators
To graphically find an x-intercept, i.e., a value of x at
which the graph crosses the horizontal axis, first press
to return the menu to the bottom of the screen.
EXIT
TI-85 Press
F1
TI-86 Press
F1
Both Use
x-intercept, and press
To find the second x-intercept, press
-key under
F
ROOT
near the other x-intercept, and press
&
1.3 Constructed Functions
Your calculator can find output values of and graph combinations of functions in the same
way that you do these things for a single function. The only additional information you need
is how to enter constructed functions in the graphing list. Suppose that a function f(x) has
been entered in y
¥ Enter y
+ y
1
2
¥ Enter y
Ð y
in y
1
2
¥ Enter y
*y
in y
1
2
¥ Enter y
/y
in y
1
2
(
)
(
)
MATH
F3
ROOT
(
)
(
)
MATH
F1
ROOT
to move the trace cursor near the first
.
ENTER
EXIT
, use
to move the trace cursor
ENTER
and a function g(x) has been entered in y
1
in y
to obtain the sum function (f+g)(x) = f(x) + g(x).
3
to obtain the sum function (fÐg)(x) = f(x) Ðg(x).
4
to obtain the product function (f . g)(x) = f(x) * g(x).
5
to obtain the quotient function (f ¸ g)(x) =
6
and the
.
.
2
f x
( )
.
g x
( )
Copyright © Houghton Mifflin Company. All rights reserved.
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