Instructions For Using - HP -225 Owner's Manual

Viewing Briefly-Displayed Information. Two situations in
and cause information to be displayed briefly:
Newly-Assigned Values. After you've pressed in response
to a prompt, the HP-22S temporarily displays letter=new value be-
fore proceeding. To lengthen the viewing time for the new value,
hold down the key.
Labels and Long Numbers. If a variable and its value are too long
to fit in the display, the letter is displayed briefly. For example, if
the current value for A is 1,234,567,891.23, the prompt for A is:
A? Displayed briefly.
1,234,567,891.23 HP-225 awaits input.
To see the first part of the prompt again, press [ SHOW ] .
Instructions for Using
Use when the unknown variable is not by itself on the left side
of the equation. To solve for a variable:
1. Optional: Enter your own guesses for the answer. (See "Entering
Your Own Initial Guesses" on page 87.)
2. Press [SOLVE].
3. If the equation has more than one variable, the HP-22S displays
a menu of all the variables in the equation. Select the unknown
variable by pressing the appropriate menu key. (For equations
with more than six variables, use the menu key {+}, if neces-
sary, to display the rest of the variables.)
4. The HP-22S prompts (requests values) for each known variable
by displaying letter?value, where value is the current value of the
variable. Respond to each prompt:
B To retain the current value, press [INPUT].
B To store a different value, key in a number (use for nega-
tive numbers) or an algebraic expression (for example, 13(x] 6
(&)and press (TNPUT].
6: Evaluating and Solving Equations 77