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HP 48gx User Manual

HP 48gx
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Lesson
17:
Solving
for
a
Variable—Numerically
If
you
want
a
numeric
solution
for
an
unknown
in
an
equation,
you
can
use
the
root-finding
application
(HP
Solve).
You
can
solve
for
a
value
of
any
variable
without
changing
the
equation—as
long
as
you
fill
in
values
for
all
other
variables
in
the
expression
or
equation.
You
can
solve
an
equation
or
expression over
and
over—for
different
known
values,
and
for
different
combinations
of
known
and
unknown
variables.
Example:
Solve
the
following
expression
for
z:
6
4
2
2-90
61a
_a?
B46
This
expression
was
created
by
the
TEACH
command
earlier
and
stored
as
the
variable,
RATFUNC
in
the
EQNS
directory.
Step
1:
Begin
the
SOLVE
application
and
choose
Zils
ove)
|
EEE
SILVE
EQUATION
38
ENTER
FUMCTION
TO
*OLVE
E0IT
[CHOO=[
[wks]
|
|
Step
2:
The
Ei:
field
is
highlighted
already,
so
choose
RATFUNC
to
be
the
current
equation.
You
will
need
to
switch
to
the
EQNS
directory
first.
Hons
FOEeo
ENTER
FUMCTION
TO
SOLVE
EDIT
[Hoos]
[uweks| [EWPR=
5-2
Solving
Equations

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HP 48gx Specifications

General IconGeneral
ModelHP 48gx
TypeGraphing Calculator
Display TypeLCD
Display Size131x64 pixels
Memory128 KB RAM
Expandable MemoryYes, via expansion cards
Release Year1993
ProcessorSaturn
Programming LanguageRPL
Power Supply3x AAA batteries
Weight255 g (9 ounces)

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