HP 39gs_40gs_Mastering The Graphing Calculator_English_E_F2224-90010

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