12 Getting Started
Getting Started12
35. Press DOWN and highlight C. Now type in 9 WV 30 so -9E30 is displayed, then press ENTER. A very large negative
number appears in C. Press UP to highlight C again. You have now entered an initial guess for the solver. Press the SOLVE menu key
and then press any other key other than CANCEL. You will see numbers rapidly converging down to a value. After a few moments,
note -26.9258... appears. Why? Because
is the same as . With many functions, setting a different initial guess
will determine which numerical solution appears. For more information about using solvers, see Chapter 6 of the HP 50g Graphing
Calculator User’s Manual or the HP 50g Graphing Calculator User’s Guide.
Using Units
In physics, engineering, and science calculations, units and unit conversions are often a critical part of problem solving. The 50g lets you
work without adding steps to your calculations when units and unit conversions are required. Let’s learn how to use them.
36. Imagine that your triangle from the previous problem now has units. We can solve using units as well. Press UP UP to select A. Now
Press 10
@-]! HIST (M) ENTER, followed by 85 @-]]!] F6 (F) COS (T) ENTER, then
1@-]]!] F3 (C) HIST (M) ENTER. You have now entered values with assigned units for A, B and C (see
Figure 24). It is necessary to assign units for all three variables so the 50g knows which units to use during the calculation, as the
50g won’t know which unit to assign to a variable without a unit. Note how the units are preceded by the underscore edit mark in
the key sequence above by pressing
@-.
37. Now press UP to select C and press the SOLVE menu key. After a short wait, 2777.092.._cm is returned (see Figure 25). Type 3000
and press ENTER. Note the currently assigned unit is retained. Press DOWN to select A and press SOLVE. The result, 15.125..._m is
returned.
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