Accessing The Math Menu Commands - HP 39gs Master Manual

A c c e s s i n g t h e M
A c c e s s i n g t h e M
The mechanics of accessing the
illustrate the process using the Polynomial function
an extremely useful one. Change into the
the key.
MATH
When you do you will see the screen on the right. The menu always first
appears with the Real functions highlighted.
We could use the arrow keys to scroll down to the Polynomial functions
but it is far faster to simply press the key labeled with the letter '
the ' ' key). It is not necessary to press the
5
notice in the screen on the right that there are two groups of functions
beginning with a ' ' - being Polynomial and Probability. To reach
P
Probability you would press the '
Once you are in the correct group, press the right arrow key to move
into the list of functions belonging to that group. Once again you have
a choice of using the arrow keys or the key corresponding to the first
letter of the function. Pressing the right arrow key again will move down
the functions a 'page' at a time. In this case, since every single function
in the Polynomial group begins with a '
of them, there is no difference between the methods. Move the highlight
down to and then press the
POLYFORM
Your view should now look like this. You will notice that the first
HOME
bracket has already been inserted for you.
Complete the expression...
POLYFORM((X+2)^5-(3X-1)^2,X)
(using the
and then press the
ENTER
− (3x −1) has been expanded on the following line to
(x + 2)
5 2
X^5+10*X^4+40*X^3+71*
There are two ways of seeing the complete result. You can move the highlight up to that line and
You could then move back and forth through the line using the arrow keys to see it in full.
to press the screen key labeled
edge of the screen can be seen by scrolling right using the arrow key. More details will be given of this
function in the Polynomial group when we get to it.
POLYFORM
A T H m e n u c o m
A T H m e n u c o m
menu is very simple. We will
MATH
HOME
ALPHA
' key again or
P
', and there is only one 'page'
P
ENTER
key to get )
^
key. You will find that the expression
...etc
. This gives (after a pause) the result shown above. The portion off the
m a n d s
m a n d s
, which is
POLYFORM
view and then press
' (on
P
key first. You will
.
key.
166
it.
A better method is