# Using Enter For Evaluation - HP 35s User Manual

Scientific calculator.

Type of Equation
Equality: g(x) = f(x)
2
Example: x
+ y
Assignment: y = f(x)
Example: A = 0.5
Expression: f(x)
3
Example: x
+ 1
Also stores the result in the left–hand variable, A for example.
To evaluate an equation:
1. Display the desired equation. (See "Displaying and Selecting Equations"
above.)
2. Press
needed. (If the base of a number in the equation is different from the current
base, the calculator automatically changes the result to the current base.)
3. For each prompt, enter the desired value:
If the displayed value is good, press
If you want a different value, type the value and press
"Responding to Equation Prompts" later in this chapter.)
To halt a calculation, press
line 2.
The evaluation of an equation takes no values from the stack — it uses only numbers
in the equation and variable values. The value of the equation is returned to the X–
register.

## Using ENTER for Evaluation

If an equation is displayed in the equation list, you can press
the equation. (If you're in the process of typing the equation, pressing
ends the equation — it doesn't evaluate it.)
2
2
= r
b x h
or
. The equation prompts for a value for each variable
or
Result for
f(x)
0.5
b
h
.
. The message  is shown in
Entering and Evaluating Equations
Result for
g(x) – f(x)
2
2
2
x
+ y
– r
y – f(x)
A – 0.5
f(x)
3
x
+ 1
. (Also see
to evaluate
b
h
only
6-11  