HP 15c - Manual (Page 185)

Section 13: Finding the Roots of an Equation 185
Keystrokes Display
“ 005– 16 – t / 20.
' 006– 12
“ 007– 16 – e – t / 20
.
1
008– 1
+ 009– 40
1 – e
– t / 20
.
5
010– 5
0
011– 0
0
012– 0
0
013– 0
* 014– 20
5000 (1 – e
– t / 20
).
® 015– 34
Brings another t-value
into X-register.
2
016– 2
0
017– 0
0
018– 0
* 019– 20
200t.
- 020– 30
5000(1 – e
– t / 20
) – 200t.
| n 021– 43 32
Switch to Run mode, key in two initial estimates of the time (for example, 5
and 6 seconds) and execute _.
Keystrokes Display
|¥
Run mode.
5
v 5.0000
Initial estimates.
6
6
´_A 9.2843
The desired root.
Verify the root by reviewing the Y- and Z-registers.
Keystrokes Display
) 9.2843
A previous estimate of the root.
) 0.0000
Value of the function at the root
showing that h = 0.