HP 33s Scientific manual 8Entering and Evaluating Equations

To edit an equation you're typing:

1.Press brepeatedly until you delete the unwanted number or function.

If you're typing a decimal number and the "_" digit–entry cursor is on, b deletes only the rightmost character. If you delete all characters in the number, the calculator switches back to the "¾" equation–entry cursor.

If the "¾" equation–entry cursor is on, pressing bdeletes the entire rightmost number or function.

2.Retype the rest of the equation.

3.Press ‘(or ‡) to save the equation in the equation list.

To edit a saved equation:

1.Display the desired equation. (See "Displaying and Selecting Equations" above.)

2.Press b(once only) to start editing the equation. The "¾" equation–entry cursor appears at the end of the equation. Nothing is deleted from the equation.

3.Use bto edit the equation as described above.

4.Press ‘ (or ‡ ) to save the edited equation in the equation list, replacing the previous version.

To clear an equation you're typing:

Press {cthen press {&}. The display goes back to the previous entry in the equation list.

To clear a saved equation:

1.Display the desired equation. (See "Displaying and Selecting Equations" above.)

2.Press {c. The display shows the previous entry in the equation list.

To clear all equations, clear them one at a time: scroll through the equation list until you come to   ! !, press ™, then press {crepeatedly as each equation is displayed until you see   ! !.

Example: Editing an Equation.

Remove 25 in the equation from the previous example.

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