HP 48g Graphing Calculator - Manual (Page 208)

value of the unknown variable for which the expression has a value
of 0 .
Program. A program to be solved must return one real number. A
solution is a value of the unknown variable for which the program
returns
0 .
To enter a new equation to solve:
1. Open the SOLVE application, if necessary, by pressing fr^fSOLVE)
There may or may not already be an equation entered into the
form.
i SOLVE EOUOTIDNi
18
ENTER FUNCTION TD_ SOLVE
2. Make sure the highlight is located in the EiQ» field and do one of
the following:
a Type the equation, expression, or program (with proper
delimiters) into the command line and press (ENTER).
a
Press EQUATION), then type in the equation or expression in
the EquationWriter, and then press fENTER).
To select a previously-created equation to solve:
1. Open the SOLVE application, if necessary, by pressing (7^(SOLVE).
2. Make sure the highlight is located in the EQ: field and press
C H 0 0 S.
3. Use the arrow kevs to find the desired variable. If it isn’t in the
current director} press C H u O S again, select the proper directory,
and press i Then find the desired variable and press
iJK once more to enter the variable into the EQ" field.
Whenever an equation is entered into the EQs field, there will also
be variable names displayed as well. There will be a label for each
variable in the current equation, except if a variable contains an
algebraic object, in which case labels are included for the variables in
the algebraic itself. For example, if the current equation is ’ Fl=B+.C ’ ,
18-2 Solving Equations