We can edit an expression without starting again. If we place the cursor over a symbol and press a new key, the new symbol replaces (overwrites) the old one.
Recalling an Entry
We can recall a previous entry by pressing 2ndENTER.
Inserting a Character
To insert a new character before a symbol, position the cursor over that symbol and press 2ndDEL to get the INS (insert) command.
Recalling an Answer
We often want to use the result from a previous calculation in a new calculation, without having to type in the number. We use the ANS key, 2nd(-), to recall the answer to the last calculation.
Modeling, Functions, and Graphs by Katherine Yoshiwara (yoshiwarabooks.org), GNU Free Documentation License 1.2 or later. Adapted for the XYZ HTML edition with the authors' permission (recorded 2026-07-04). License: GFDL-1.2-or-later.
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