HP 33s - Manual (Page 336)

D–12 More about Solving
Now attempt to find a negative root by entering guesses 0 and –10. Notice that
the function is undefined for values of x between 0 and –0.3 since those values
produce a positive denominator but a negative numerator, causing a negative
square root.
Keys: Display: Description:
0 I X
10 ^
.
_
| H
!1%ª1%-
)22 Selects Equation mode;
displays the left end of the
equation.
 X ! No root found for f(x).
‡ Clears error message; cancels
Equation mode.
| Š X %/
)
Displays the final estimate of
x
.
Example: A Local "Flat" Region.
Find the root of the function
f(x) = x + 2 if x < –1,
f(x) = 1 for –1 ≤ x ≤ 1 (a local flat region),
f(x) = –x + 2 if x >1.
In RPN mode, enter the function as the program:
!
- %
º6¸@
!
.
-+.
º5¸@