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Instructions for Using
Use
when the unknown variable appears only once in the
equation, by itself on the left side of the equation. You can also use
to evaluate expressions. For example, you can use [EVAL]:
To calculate F in the equation:
F=MxA
To calculate E in the equation:
E=S5xMxy~2
To calculate S* in the equation:
$=5x(1+I>*N
To evaluate the expression:
T*2+(P+12)
To evaluate an equation:
1. Press [EVAL].T
2. The HP-22S prompts (requests values) for each variable on the
right side of the equation 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 [INPUT].
3. When you've responded to all the prompts, the HP-22S evalu-
ates the equation or expression and displays the answer.
When it evaluates expressions,
prompts for every variable and
calculates the value of the expression. The result is labeled EXPR.
* The equation calculates a new value for S using a value for S that you input.
TIf an equation is not in the form unknown variable = algebraic expression, the HP-22S auto-
matically switches to [SOLVE].
6: Evaluating and Solving Equations
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