HP 40gs - Manual (Page 185)

Computer Algebra System (CAS) 14-3
3. Press and to
select just the 20 in the
term.
4. Press the menu
key and choose FACTOR.
Then press .
Note that the FACTOR
function is added to the
selected term.
5. Press to factor
the selected term.
6. Press to select the
entire second term, and
then press
to
simplify it.
7. Press
to select the 45
in the first term.
8. As you did earlier, press
the menu key and
choose FACTOR. Then
press and to
factor the selected term.
9. Press to select the
entire second term, and
then press
to
simplify it.
20
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