Sharp EL-9900 - Manual (Page 208)

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Chapter 12: The SOLVER Feature
The Graphic method is another way of approximating solutions,
using graphical representations. This method is particularly useful
when finding more than one solution on a graph axis.
Example
Obtain values for “Y = X 3 – 3X 2 + 1”, when Y = 0.
1. Press @ ' to enter SOLVER. Clear screen entries by
pressing C several times.
2. Enter “Y = X 3 – 3X 2 + 1” into
the initial window, and press
E.
3. In the next window, set the Y
value as “0”, and press
E. The right side value
of the equation is now set.
Note: Unlike in the Newton’s method,
the X value will not be assumed
as the starting point for the
Graphic method.
4. Before proceeding further,
you will need to set the
SOLVER to the Graphic
method. Press @ '
to call up the SOLVER
menu, and press A (for
“A METHOD”), then 3 (for “3 Graphic”). The Graphic
method is now set.
5. Press @ h to proceed.
6. Next in the following window,
specify the range of analysis
that will incorporate all
possible solution. In this
example, we will set the
beginning point at “ - 1”, and
the end point at “3”. Press E at each variable entry.
Graphic method