HP 32SII - Manual (Page 100)

6–12 Entering and Evaluating Equations
File name 32sii-Manual-E-0424
Printed Date : 2003/4/24 Size : 17.7 x 25.2 cm
The following table shoves the two ways to evaluate equations.
Type of Equation Result for š Result for W
Equality: g (x) = f(x)
Example: x
2 + y 2 = r 2
g (x) – f(x)
x 2 + y 2 – r 2
Assignment: y = f(x)
Example: A = 0.5
× b x h
f(x)
0.5 × b × h
y – f(x)
A – 0.5 × b × h
Expression: f(x)
Example: x
3 + 1
f(x)
x 3 + 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 š or W . The equation prompts for a value for each
variable needed. (If you've changed the number base, it's automatically
changed back to base 10.)
3. For each prompt, enter the desired value:
If the displayed value is good, press f .
If you want, a different value, type the value and press f . (Also see
"Responding to Equation Prompts" later in this chapter.)
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. The LAST X register isn't affected.
Using ENTER for Evaluation
If an equation is displayed in the equation list, you can press š to
evaluate the equation. (If you're in the process of typing the equation,
pressing
š only ends the equation—it doesn't evaluate it.)