Using computer algebra commands, Example, Subst – HP 49g Graphing Calculator User Manual
Page 230
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5. Press
0.
The two previous results—169—and 323—are now treated as the
arguments in a fiuther operation. This operation replaces the
arguments with the result of the operation, that is, the difference
between tire first result and the second.
6. Press
11)7© to place the result of ^ on level 1.
If the calculator is in exact mode, the result appears as a fraction.
7. Press 0 to add this to tlie previous result.
If the calculator is in exact mode, the answer is displayed as a niunber
and a fraction. To display the approximate answer to 12 digit accuracy,
press ©@3
Using computer algebra commands
Example:
To substitute x = y + 2> in x
+ 3
a
-
+
7
1. Use Equation Writer to create
a
*
+ 3
a
+
7
and press
(ENTER)
to place it on
stack level 1.
2. Use Equation Writer to create the substitution, a: = ?/ + 3, and press
(ENTER)
to place it on stack level 1. This pushes the previous expression
to stack level 2.
3. Press 0{^ to access the Algebra command menu and select the
SUBST
command. The HP 49G perfonus the substitution and the result
appears at stack level 1.
Page E-6
Working in RPN mode