(12C Platinum) Cubic Equation

[Thomas Klemm]

(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 CF_j
-4 CF_j
-5 CF_j

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