HP 39gs Master Manual page 345

Example 4: Factorizing expressions
If you highlight an expression such as (2x+3)
the result extends beyond the screen we will scroll through it using the arrow keys. The results can be
factorized again using the
In this example we will also illustrate the use of the CAS History to fetch
a previous calculation.
The sequence of keys for this is...
Expansion...
2 + 3
4
Examination...
Note: Alternatively you can press
in the view screen. This is equivalent to the
the screen.
HOME
Factorization...
Press until the entire polynomial is highlighted (or press
). While the required expression is highlighted, fetch
SHIFT
the
COLLECT
ENTER ENTER
Note:
Firstly, remember that the extent of the highlight plays a very important role. Only the highlighted
section of the polynomial will be included in the
factorizations if desired. In this case the entire expression should be highlighted before
inserted.
Secondly, when
for the entire expression, including
highlighted then the entire screen is evaluated.
4 and press
function.
COLLECT
- 35
ENTER
and scroll through the result
function from the
is pressed the evaluation is done on whatever is highlighted. It is necessary
ENTER
COLLECT
then the CAS will expand the bracket. Since
ENTER
command in
menu.
brackets. This allows partial
COLLECT
, to be highlighted if it is to be evaluated. If nothing is
345
is
COLLECT