HP 35s

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.

