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Because many equations have two sides separated by "=", the basic value of an
equation is the difference between the values of the two sides. For this calculation,
"=" in an equation essentially treated as "_". The value is a measure of how well
the equation balances.
The HP 33s has two keys for evaluating equations:
actions differ only in how they evaluate assignment equations:
t
returns the value of the equation, regardless of the type equation.
Ï
returns the value of the equation — unless it's an assignment–type
equation. For an assignment equation,
side only, and also "enters" that value into the variable on the left side — it
stores the value in the variable.
The following table shows the two ways to evaluate equations.
Type of Equation
Equality: g(x) = f(x)
2
Example: x
+ y
Assignment: y = f(x)
Example: A = 0.5 × b x h
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.)
Ï
2. Press
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
If you want a different value, type the value and press
"Responding to Equation Prompts" later in this chapter.)
6–10
Entering and Evaluating Equations
File name 33s-E-Manual-1008-Publication(1st).doc
Printed Date : 2003/10/8
Result for
2
2
= r
0.5 × b × h
t
or
. The equation prompts for a value for each variable
Size : 13.7 x 21.2 cm
Ï
and
Ï
returns the value of the right
Result for
Ï
g(x) – f(x)
2
2
2
x
+ y
– r
f(x)
A – 0.5 × b × h
f(x)
3
x
+ 1
¥
.
Page : 386
t
. Their
t
y – f(x)
¥
. (Also see
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