HP 33S Owner's Manual

Entering and Evaluating Equations
6–9
File name 33s-E-Manual-1008-Publication(1st).doc Page : 386
Printed Date : 2003/10/8 Size : 13.7 x 21.2 cm
Keys: Display: Description:
º d

Shows the current equation in the
equation list.
~

Turns on Equation–entry mode and
shows the "

" cursor at the end of
the equation.
~ ~

Deletes the number 25.
Ï

Shows the end of edited equation
in the equation list.
Å

Leaves Equation mode.
Types of Equations
The HP 33s works with three types of equations:

Equalities. The equation contains an "=", and the left side contains more
than just a single variable. For example, x
2
+ y
2
= r
2
is an equality.

Assignments. The equation contains an "=", and the left side contains
just a single variable. For example, A = 0.5
×
b
×
h is an assignment.

Expressions. The equation does not contain an "=". For example, x
3
+ 1
is an expression.
When you're calculating with an equation, you might use any type of equation —
although the type can affect how it's evaluated. When you're solving a problem
for an unknown variable, you'll probably use an equality or assignment. When
you're integrating a function, you'll probably use an expression.
Evaluating Equations
One of the most useful characteristics of equations is their ability to be
evaluated — to generate numeric values. This is what enables you to calculate a
result from an equation. (It also enables you to solve and integrate equations, as
described in chapters 7 and 8).

HP 33S Specifications

General

Type	Scientific
Form factor	Pocket
Product color	Silver
Digits	10 digits
Display number of lines	2 lines
Keyboard type	Alphanumeric
Menus and prompts	Yes

Weight and Dimensions

Dimensions (WxDxH)	157 x 16 x 81 mm