HP 15c - Manual (Page 237)

Appendix D: A Detailed Look at _ 237
Again, use the same initial estimates to find the next root.
Keystrokes Display
|¥ 0.0000
Run mode.
10
“ v –10.0000
Same initial estimates.
20
“ –20
´ _ 2 8.4999
Third root.
O 2 8.4999
Stores root for deflation.
) ) –1.0929 –07 Deflated function value near
zero.
Now change your subroutine to eliminate the third root.
Keystrokes Display
|¥ 000–
Program mode.
| ‚ |
‚ 034– 10 Line before n.
® 035– 34 Brings
x into X-register.
l 2 036- 45 2
- 037– 30 Deflation for third root.
÷ 038– 10
Find the fourth root.
Keystrokes Display
|¥ –1.0929 –07
10
“ v –10.0000
Same initial estimates.
20
“ –20
´ _
2
8.5001
Fourth root.
O 3 8.5001
Stores root for reference.
) ) –0.0009
Deflated function value
near zero.