HP 15c Scientific –20, 000–, 034–, 035–, 037–, 038–, –0.0009, –10.0000, –10.0000, –208.4999, –1.0929 –07, –1.0929 –07

Appendix D: A Detailed Look at _ 237

Again, use the same initial estimates to find the next root.

Keystrokes ¥

10 “v

20“

´_2 O2

))

Display

0.0000

–10.0000

–20 8.4999 8.4999–1.0929 –07

Run mode.

Same initial estimates.

Third root.

Stores root for deflation.

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.
l2	036-	45 2
-	037–	30	Deflation for third root.
÷	038–	10

Find the fourth root.
Keystrokes		Display
¥		–1.0929 –07
10	“v	–10.0000
20	“	–20
´_2		8.5001
O3		8.5001
))		–0.0009

Same initial estimates.

Fourth root.

Stores root for reference.

Deflated function value near zero.