Defining functions
You can assign a definition to a function using the CAS.
As an example, define
f
(
x
) =
x
+
x
2
+
x
3
.
Type the expression on the right of
the equals sign. Then, press the
STO
(or store) key. Type f(x).
Remember that you need the
ALPHA
key to access f.
Press
ENTER
.
Type f(1), and press
ENTER
.
Evaluate the function for other values of
x
.
You can also define functions of more than one variable.
As an example, consider the formula for the volume of a cylinder
V
=
π
r
2
h
.
Define a function
v
(
r
,
h
) as
π
r
2
h.
Evaluate
v
(
r
,
h
) for various values of
r
and
h
.
If you would like the answer
displayed as an approximate value,
rather than a multiple of
π
, you can
select the
MODE
menu, scroll down
to
Exact/Approx
, and select
APPROXIMATE
.
Tech Tip:
when you are finished
with the CAS, it is wise to return the
display mode to
AUTO
.
