HP 33s User Manual page 335

<
< º Î
Watch what happens when you use negative values for guesses:
Keys:
z e
1 X
z º d
2
Û
X
Example: Find the root of the equation.
Enter the equation as an expression:
Keys:
º d
? h ¯ º
X
y h Ù Ë
X
º | º | Ã
Ë Ï
5
º Î
Å
First attempt to find a positive root:
Keys:
e
0 X
10
º d
Û
X


Display:




[x (x 0.3)]
Display:


3






Display:

 _ 
 Selects Equation mode; displays


Previous estimate is the same.
f (x) = 0
Description:
Your negative guesses for the
root.
Selects Equation mode; displays
the equation.
Solves for X ; displays the result.
0 5 . 0
Description:
Selects Equation mode.
Enters the equation.
Checksum and length.
Cancels Equation mode.
Description:
Your positive guesses for the
root.
the left end of the equation.
Calculates the root using
guesses 0 and 10.
More about Solving
D–11