Ievali - HP -22S Owner's Manual

Instructions for Using
I
EVAL
I
Use
I
EVAL
I
when the unknown variable appears only once in the
equation, by itself on the left side of the equation. You can also use
I
EVAL
I
to evaluate expressions. For example, you can use
I
EVAL
I:
To calculate F in the equation:
F
=
M x A
To calculate E in the equation:
E=.5xMxV ..... 2
To calculate S* in the equation:
s
=
s
x (
1 + I ) . . . . . N
To evaluate the expression:
T ..... 2·:-( P + 1 2 )
To evaluate an equation:
1. Press
I
EVAL
I.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:
• To retain the current value, press
I
INPUT
I .
• To store a different value, key in a number (use
Efl
for nega-
tive numbers) or an algebraic expression (for example, 1306
[E) and press
I
INPUT
I.
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, I
EVAL
I 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.
t If an equation is not in the form
unknown variable
=
algebraic expression,
the Hp·22S auto-
matically switches to
I
SOLVE
I.
6: Evaluating and Solving Equations 75