HP HP-15C

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.