HP 11C real root finder [Newton Method]

[Thomas Klemm]

Using storage arithmetic allows us to get rid of a few steps:

LBL 0
RCL 1
GSB 1
RCL 1
GSB 2
/
STO- 1
ABS
RCL 2
X<=Y?
GTO 0
RCL 1
RTN


You made a mistake calculating the 1st derivative.
This is the corrected program:

f'(x)= 3x^2 - 6x - 6 = (3x - 6)x - 6
f'(x) code

LBL 2
ENTER
ENTER
3
*
6
-
*
6
-
RTN

Kind regards
Thomas