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D-4 More about Solving
Now, solve the equation to find the 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:
Select Equation mode.
X
X
X
Enters the equation.
Checksum and length.
Cancels Equation mode.
Keys: Display: Description:
X
_ Initial guesses for the root.
Selects Equation mode; displays
the left end of the equation.
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.