HP 15c - Manual (Page 190)

190 Section 13: Finding the Roots of an Equation
Keystrokes Display
- 003– 30
* 004– 20 (x – 6) x.
8
005– 8
+ 005– 40
* 007– 20 ((x – 6) x + 8) x.
4
008– 4
* 009– 20 4 ((x – 6) x + 8) x.
7
010– 7
. 011– 48
5
012– 5
- 013– 30
|n 014– 43 32
It seems reasonable that either a tall, narrow box or a short, flat box could
be formed having the desired volume. Because the taller box is preferred,
larger initial estimates of the height are reasonable. However, heights
greater than 2 decimeters are not physically possible (because the metal is
only 4 decimeters wide). Initial estimates of 1 and 2 decimeters are
therefore appropriate.
Find the desired height:
Keystrokes Display
| ¥
Run mode.
1
v 1.0000
Initial estimates.
2
2
´ _ 3 1.5000
The desired height.
) 1.5000
Previous estimate.
) 0.0000
f(x) at root.