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D–4 More about Solving
File name 33s-English-Manual-040130-Publication(Edition 2).doc Page : 388
Printed Date : 2004/1/30 Size : 13.7 x 21.2 cm
Keys: Display: Description:
º
d
Select Equation mode.
2
z ¸
h
X
)
3
Ù
4
¸
h
X
)
2
Ã
6
¸ h
X
Ù
8
Ï
Enters the equation.
º
Î
Checksum and length.
Å
Cancels Equation mode.
Now, solve the equation to find the root:
Keys: Display: Description:
0
e
X 10
_ Initial guesses for the root.
º
d
Selects Equation mode;
displays the left end of the
equation.
Û
X
Solves for X; displays the
result.
<
Final two estimates are the
same to four decimal places.
<
f(x) is very small, so the
approximation is a good root.
Example: An Equation with Two Roots.
Find the two roots of the parabolic equation:
x
2
+ x – 6 = 0.
Enter the equation as an expression:
Keys: Display: Description:
º
d
Selects Equation mode.
h
X
)
2
Ù
h
X
Ã
6
Ï
Enters the equation.