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EL-9900 Graphing Calculator
There may be differences in the results of calculations and graph plotting depending on the setting.
Return all settings to the default value and delete all data.
As the Solver feature is only available on the Advanced keyboard, this section does not apply to the
Basic keyboard.
5-3
The Solver mode is used to solve one unknown variable by inputting known variables.
There are three methods: Equation, Newton’s, and Graphic. The Newton’s method can
be used for more complicated equations. This method implements an iterative approach
to find the solution once a starting point is given.
Solving a Literal Equation Using Newton's Method (Area of a Trapezoid)
1. Find the height of a trapezoid with an area of 25in
2
and bases of length 5in
and 7in using Newton's method. (Set the starting point to 1.)
2. Save the formula as “A TRAP”.
3. Find the height of a trapezoid with an area of 50in
2
with bases of 8in and 10in
using the saved formula. (Set the starting point to 1.)
Find the height of a trapezoid from the formula for calculating the area of a trapezoid
using Newton’s method.
The formula : A= h(b+c)
Example
1-1
Access the Solver feature.
Select Newton's method
for solving.
1-2
1-3
Enter the formula A = h(b+c).
1
2
(A = area h = height b = top face c = bottom face)
1
2
Enter the values:
A = 25,
B = 5,
C = 7
1-4
This screen will appear a few
seconds after “SOLVER” is dis-
played.
2nd F
SOLVER
2nd F
SOLVER
A
ALPHA
A
2
ALPHA
1
a
/b
2
ALPHA
H
ALPHA
ALPHA
ENTER
=
ENTER
ENTER ENTER
(
+
)
C
2
5
5
7
B
Before
Starting
NotesStep & Key Operation Display