Sharp EL-9900 - Manual (Page 207)

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Chapter 12: The SOLVER Feature
6. The following window shows
the approximate value of X
(0.449489742), the right side
value of the equation
(assumed as “0”, at step #2),
the left side value (which the
entered expression results to this value when the value X is
entered), and the difference between the left and the right
side.
7. Since the L-R difference
above indicates a margin of
error, try entering smaller
steps. Press C to go
back to step #3. Enter the
value of X, then press @
h to execute the SOLVER again. When the next window
appears, try entering smaller step value (“0.00001”, for
example).
8. Press E to register the
step value change, then
@ h. Although the
value of X appears to be
unchanged, the margin of
error will have become small
enough (“0”, in this example), to be as close to zero as
possible.
Note: As you may well know, there may be more than one solution to
the equation. To obtain the value of the other solutions, set the
starting point of Newton’s method lower (“ - 10”, for example) or
execute the SOLVER again with the current solution as a starting
point.