HP 39gs Master Manual page 316

ii. When discussing the concept of a domain, the
very useful in developing this (see right).
In the view, enter the functions shown right, un
SYMB
first two non-composite functions. In the
used the
NUM SETUP
increase in steps of 0.25.
Obviously discussion will now center on why f x
same as f x ( ) = x , and why f
for x<0.
iii. Composite functions can easily be defined, as can be seen in the
examples to the right.
In the first screen shot,
entered into the
SYMB
The second, substituted view is obtained by moving the highlight to
and pressing the
F2(X)
If desirable, you can further simplify using
highlight on
F2(X)
the expression and use the
Now move to the end and add "
.
Pressing again now will give the result shown right.
NUM
view to set the scale to start at -1 and
( )
( )
is not the same as f
f x
1 2
2 and
F1(X)=X -X F2(X)=F1(X+3)
view.
button.
, press . Move the highlight to the start of
button to enter "
MATH
" to the expression and press
,X)
view can be
NUM
ing the
view shown, I have
is not the
( ) =
2
x
(
(
f x
2 1
have been
. With the
POLYFORM
".
POLYFORM(
316
)
)