The iterative search for a solution sometimes takes several minutes. (You can halt the search at any time by pressing any key except @) There are four possible outcomes:
Case 1: The calculator displays an answer. This is very likely the true solution for the unknown variable.
There are two situations in which the Solver returns a case 1 answer:
Case la: LEFT－RIGHT is exactly zero.
Case lb: LEFT－RIGHT is not zero for either estimate. However, the Solver has found two estimates that cannot get any closer
together. (Numbers that are as close together as possible are called neighbors.) Furthermore, LEFT－RIGHT is a positive value for one estimate and a negative value for the other estimate.
Case 1a: | Case 1b: |
|
is exactly 0. |
| is not exactly 0. |
| and | are relatively |
| close together. The two estim- | |
| ates are "neighbors". | |
If you want to know whether LEFT－RIGHT is exactly zero, press the menu key for the unknown variable. If LEFT－RIGHT is not equal to zero, the calculator displays the values of LEFT and RIGHT.
The equation could have more than one iterative solution. If the answer does not seem reasonable, enter one or two guesses and
B: More About Calculations 243
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