(11C) CUBIC EQUATION

[Dieter]

Gamo, I see you updated your initial post, but there are still errors:

(06-09-2018 11:49 AM)Gamo Wrote:  LBL A // Input c Enter b Enter c then press A

Enter c, then b, then c once more ?!?

(06-09-2018 11:49 AM)Gamo Wrote:  RCL 3 // If D ˂ 0 then press LBL C for the answer of complex roots

If you press [LBL] [C] on an 11C (or another calculator) nothing will happen. ;-)
You have to press [GSB] [C] or [C].

(06-09-2018 11:49 AM)Gamo Wrote:  Example: X^3 - 6X^2 + 11X - 6 = 0

6 CHS ENTER
11 ENTER
6 CHS ENTER A display 0

The last ENTER is wrong, it has to be removed.
But OK, the input order here seems to be a ENTER b ENTER c.

(06-09-2018 11:49 AM)Gamo Wrote:  B Display 3 R/S 0.25 // D is greater than or equal zero go ahead with R/S

The returned 3 is the first root. But what is "0,25"?

(06-09-2018 11:49 AM)Gamo Wrote:  Example: X^3 - 4X^2 + 8X - 8 = 0

8 CHS ENTER
8 ENTER
4 CHS A Display 0

?!? Now the input order is c ENTER b ENTER a ?!?

So there are three variations in your post:

c ENTER b ENTER c
a ENTER b ENTER c
c ENTER b ENTER a

Gamooo.... ;-)

Dieter