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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 ‘
P
’ (on the ‘
5
’ key).
It is not necessary to press the
ALPHA
key first. You will notice in the screen
on the right that there are two groups of functions beginning with a ‘
P
’ - being
Polynomial and Probability. To reach Probability press the ‘
P
’ key again.
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 ‘
P
’, and
there is only one ‘page’ of them, there is no
difference between the methods. Move the
highlight down to
POLYFORM
and then press
the
ENTER
key.
Your
HOME
view should now look like this. You
will notice that the first bracket has already
been inserted for you.
Complete the expression…
POLYFORM((X+2)^5-(3X-1)^2,X)
(using
X
y
key to get ^)
and then press the
ENTER
key.
You will find that the expression
5
2
(
2)
(3
1)
x
x
+
−
−
has been expanded on the
following line to
X^5+10*X^4+40*X^3+71*...etc
There are two ways of seeing the complete
result.
You can move the highlight up to that line and
it. You could then move
back and forth through the line using the arrow keys to see it in full.
A better method is to press the screen key labeled
. This gives (after a
pause) the result shown above. The portion off the edge of the screen can
be seen by scrolling right using the arrow key. More details will be given of
this
POLYFORM
function in the
Polynomial
group when we get to it.
