Types Of Equations; Evaluating Equations - HP 33s Owner's Manual

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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
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
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).
File name 33s-E-Manual-1008-Publication(1st).doc
Printed Date : 2003/10/8
Display:
 Shows the current equation in the
 Turns on Equation–entry mode and
 Deletes the number 25.
 Shows the end of edited equation

Entering and Evaluating Equations
Page : 386
Size : 13.7 x 21.2 cm
Description:
equation list.
shows the "  " cursor at the end of
the equation.
in the equation list.
Leaves Equation mode.
2 2 2
+ y = r is an equality.
3
+ 1
6–9