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Entering and Evaluating Equations
6–1
File name 33s-English-Manual-040130-Publication(Edition 2).doc Page : 388
Printed Date : 2004/1/30 Size : 13.7 x 21.2 cm
6
Entering and Evaluating Equations
How You Can Use Equations
You can use equations on the HP 33s in several ways:
For specifying an equation to evaluate (this chapter).
For specifying an equation to solve for unknown values (chapter 7).
For specifying a function to integrate (chapter 8).
Example: Calculating with an Equation.
Suppose you frequently need to determine the volume of a straight section of pipe.
The equation is
V = .25
π
d
2
l
where d is the inside diameter of the pipe, and l is its length.
You could key in the calculation over and over; for example, .25
Ï
º
j
¸
2.5
=
¸
16
¸
calculates the volume of 16 inches of 2
1
/
2
–inch
diameter pipe (78.5398 cubic inches). However, by storing the
equation, you get
the HP 33s to "remember" the relationship between diameter, length, and
volume — so you can use it many times.
Put the calculator in Equation mode and type in the equation using the following
keystrokes:
Keys: Display: Description:
º
d
or the current equation
Selects Equation mode, shown
by the
EQN annunciator.