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HP 35s User Manual Page 124

Scientific calculator.
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2. Press
every other variable in the equation.
3. For each prompt, enter the desired value:
If the displayed value is the one you want, press
If you want a different value, type or calculate the value and press
(For details, see "Responding to Equation Prompts" in chapter 6.)
You can halt a running calculation by pressing
When the root is found, it's stored in the relation variable, and the variable value is
viewed in the display. In addition, the X–register contains the root, the Y–register
contains the previous estimate value or Zero, and the Z–register contains the value
of the root D-value(which should be zero).
For some complicated mathematical conditions, a definitive solution cannot be
found — and the calculator displays   . See "Verifying the Result"
later in this chapter, and "Interpreting Results" and "When SOLVE Cannot Find a
Root" in appendix D.
For certain equations it helps to provide one or two initial guesses for the unknown
variable before solving the equation. This can speed up the calculation, direct the
answer toward a realistic solution, and find more than one solution, if appropriate.
See "Choosing Initial Guesses for Solve" later in this chapter.
Solving the Equation of Linear Motion.
The equation of motion for a free–falling object is:
where d is the distance, v
acceleration due to gravity.
Type in the equation:
Solving Equations
then press the key for the unknown variable. For example,
X to solve for x. The equation then prompts for a value for
d = v
t +
is the initial velocity, t is the time, and g is the
g t


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