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📚 Modeling, Functions, and Graphs
Chapters ▾
1 Functions and Their Graphs2 Modeling with Functions3 Power Functions4 Exponential Functions5 Logarithmic Functions6 Quadratic Functions7 Polynomial and Rational Functions8 Linear Systems9 Sequences and Series10 Algebra Skills Refresher11 Using a Graphing Calculator12 Using a GeoGebra Calculator App13 Glossary14 Properties of Numbers15 Geometry formulas16 GNU Free Documentation License

11.3 Editing Expressions

Overwriting

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 2nd ENTER.

Inserting a Character

To insert a new character before a symbol, position the cursor over that symbol and press 2nd DEL 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.