HP 48G Series User Manual

Step 1: You're already working with RATFUNC, and the =: variable
field is highlighted, so you are ready to enter the guess.
2 (7) (ENTER)
ENTER FUNCTION TO SOLVE
[ECT [CHOOZ] | LEER
Step 2: Solve for : again and examine the new solution.
SOLVE ERUATIOM 33
Se NS ed oo
Ec:
ue BIE
-3. B8000AEEEE 1
Sian Rewersal
ENTER VALUE OR PRESS SOLVE
I I ET
Step 3: Press iE to remove the message box.
Interpreting the Results
The Sian Esuverzal message means that the solver has found two
adjacent sample points at which the value of the expression is opposite
in sign, but hasn’t found one sample point that makes the expression
zero (to 12 digits). This can happen at a legitimate solution—the
finite numerical precision making it impossible for the HP 48 to find
the actual zero. But it can also occur at a discontinuity, where the
graph of the equation “jumps” across the x-axis without ever touching
it.
Two kinds of Sign Reversals
BY
5
FCN EDIT JeANCL
7
Actual Root Discontinuity
ET] GE TE
5-4 Solving Equations

HP 48G Series Specifications

General

Model	HP 48G Series
Type	Graphing Calculator
Display Type	LCD
Display Size	131x64 pixels
Programming Language	RPL (Reverse Polish Lisp)
Memory	32 KB RAM
Processor	Saturn
Power Supply	3x AAA batteries
Connectivity	Infrared (IR)