HP 48gx User Manual

Step 3: Since RATFUNC only has one variable, it must be the
unknown variable. Solve for = by highlighting its field and
pressing SLAVE.
(V) 20LYE ex SOLVE EQUATIOM 223
Ec: wo Coa +4. (6+
Hr pg
ENTER YALUE OF PRESS SOLVE
EDT] | [wAks[INFO [SOLVE
Step 4: Press 1 to determine the nature of the most recent
solution found by the root-finder. The Zz message
indicates that the solver found a solution—a point where the
expression evaluates to “exactly” (that is, to 12 significant
digits) zero.
wes SOLVE ECQUATIOM $8 aa
EQ: "E(x 2-90 +4 A (E+
wt Ber 1.5 |
Zero
ENTER VALUE OF PRESS SOLVE
[1 1 | OK
Step 5: Press [ik to remove the message box.
Searching for Multiple Solutions
Although an equation or expression may have more than one solution,
the calculator stops when it finds one. Because there was no value
listed for = before you chose to solve for z, the solver began looking
for an answer at = 0 and reported the first solution it found.
However, you can tell the solver to begin its search from a different
point by entering an estimate of the solution before solving for a
variable.
Example: Re-solve RATFUNC beginning with a guess of z = —2.
Solving Equations 5-3

HP 48gx Specifications

General

Model	HP 48gx
Type	Graphing Calculator
Display Type	LCD
Display Size	131x64 pixels
Memory	128 KB RAM
Expandable Memory	Yes, via expansion cards
Release Year	1993
Processor	Saturn
Programming Language	RPL
Power Supply	3x AAA batteries
Weight	255 g (9 ounces)