HP -15C Owner's Handbook Manual page 237

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