Lesson 17: solving for a variable—numerically – HP 48G User Manual
Page 56
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Lesson 17: Solving for a Variable—Numerically
If you want a mimeric 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 ecjuation—as long as you
fill in values for all other variables in the expression or ecfuation.
You can solve an equation or expression over and over—for different
known values, and for different combinations of known and unknown
variables.
Exaiiiple:
Solve the following expression for
x :
6
4
2
+
.(■- -“9 ' 6 + r —
x ~ ' x ~
+ 5r + 6
This expression was created by the TEACH command
earlier and stored as the variable,
R A T F U N C
in the
E Q N S
directory.
S t e p 1 :
Begin the SOLV'E application and choose S o l v e
Equ-at i or........ „.
ilciJ
ENTER FUNCTION TD_ SOLVE
S t e p
2 :
The EQ= field is highlighted already, so choose
R A T F U N C
to be the current eciuation. You will need to swdtch to the
E Q N S
directory first.
i H O O S
C H O U S
( g ® ® ®
® • • • •
ENTER FUNCTION TO
BiaiaHTiTiTHHB
SOLVE
5-2 Solving Equations