(12C Platinum) Cubic Equation
02-05-2019, 06:09 AM
Post: #6
 Thomas Klemm Senior Member Posts: 1,977 Joined: Dec 2013
RE: (12C Platinum) Cubic Equation
(02-05-2019 04:24 AM)Gamo Wrote:  Can the guess be negative integer?

It appears that you can't solve for negative roots.
But you can just do a transformation: $$x \rightarrow -x$$
This transforms the equation to:

$$2x^3 + 3x^2 - 4x - 5 = 0$$

Enter coefficients:

2 CF0
3 CFj
-4 CFj
-5 CFj

Enter guess:

1 R/S
1.3508

And then transform the result back again to get the solution of the original equation:

-1.3508

Cheers
Thomas
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 Messages In This Thread (12C Platinum) Cubic Equation - Gamo - 01-12-2019, 09:27 AM RE: (12C Platinum) Cubic Equation - Albert Chan - 01-12-2019, 01:39 PM RE: (12C Platinum) Cubic Equation - Albert Chan - 02-04-2019, 04:10 PM RE: (12C Platinum) Cubic Equation - Thomas Klemm - 02-04-2019, 08:13 PM RE: (12C Platinum) Cubic Equation - Albert Chan - 02-05-2019, 10:24 PM RE: (12C Platinum) Cubic Equation - Gamo - 02-05-2019, 04:24 AM RE: (12C Platinum) Cubic Equation - Thomas Klemm - 02-05-2019 06:09 AM RE: (12C Platinum) Cubic Equation - Thomas Klemm - 02-05-2019, 06:20 AM

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