HP 49g Graphing Calculator - Manual (Page 133)

Solving an equation
In solving an equation, the HP 49G uses any existing values it has stored
for the variables in the equation. These may be variables that you have
created, or variables that the calculator has used in, or generated from,
previous calculations. Before you solve an equation, if necessaiy use File
Manager to delete any variables corresponding to the ones that your
equation contains.
Example
This example demonstrates how to solve an equation in x and y for x,
when y = 2. The equation is:
4cos^-j+3sin(7ix) = Jl
1. Open the numeric solver choose list and
select
SOLVE
equation
from the menu. The
Solve Equation input form is displayed.
2. Enter the equation to solve and place it in
the
EQ
field.
4®@@©(lPi)Y®©3®(si)
0(©®@®©0®2(EiI)
3. The variables that the equation contains
are displayed. Enter the known value for y
in the Y: field.
El^tir furictii>n to
solve ECUilTIiin?
Eq=4*C0S<:K.--Y>H-3»SIN<>
K:
Enter yqlug or prj5J SOLVE
1350
IUIU2 0K
4. Select the
X:
field and press
SOLVE
to solve
the equation for x. The solution appears in
the X: field.
©SOLVE
El
I SOLVE EiUftTIOn^
4*C0SiXxY:)+3*SIhKX„
Efttii" function to iOlMC
ilSSS I
EiUSTIOnl^
El ■ 4*cost:x.''Y>+3*siN':x,..
K:
I- 2
3.89352340302
Enter value or pr_e55 SOLVE
OMIBSSIH
To speed up the solve process, enter an estimate of the value for
the variable that vou want to find.
Solving equations Page 6-3