Solve Quartic with Casio FX-115MS
03-13-2020, 06:30 PM
Post: #8
 Albert Chan Senior Member Posts: 2,355 Joined: Jul 2018
RE: Solve Quartic with Casio FX-115MS
(02-01-2020 12:27 PM)Albert Chan Wrote:  Unfortunately, the roots are in wrong order !

Solving (x^2 + c1 x + d1)(x^2 + c2 x + d2) = 0, gives all wrong roots.

Can anyone try the actual code, or am I mistaken somewhere ?
Source in https://thomasokken.com/free42/42progs/, named G4G

Tried above program just now, for Quartic x^4 + 2 x^3 + 3 x^2 + 4 x + 5 = 0

2 Enter 3 Enter 4 Enter 5 XEQ "G4G"

Output "X=I,Z=I" ⇒ roots = Y ± X*I, T ± Z*I ≈ -1.2878 ± -0.6555*I, 0.2878 ± -1.5204*I

Correct root should be -1.2878 ± 0.8579*I, 0.2878 ± 1.416*I

G4G code indeed gives the wrong roots
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 Messages In This Thread Solve Quartic with Casio FX-115MS - Albert Chan - 11-29-2018, 05:28 PM RE: Solve Quartic with Casio FX-115MS - Albert Chan - 11-29-2018, 10:31 PM RE: Solve Quartic with Casio FX-115MS - Albert Chan - 02-04-2019, 01:39 PM RE: Solve Quartic with Casio FX-115MS - Albert Chan - 08-24-2019, 12:47 PM RE: Solve Quartic with Casio FX-115MS - SlideRule - 03-14-2020, 01:28 AM RE: Solve Quartic with Casio FX-115MS - Albert Chan - 08-30-2019, 02:02 PM RE: Solve Quartic with Casio FX-115MS - Albert Chan - 09-02-2019, 02:35 PM RE: Solve Quartic with Casio FX-115MS - Albert Chan - 02-01-2020, 12:27 PM RE: Solve Quartic with Casio FX-115MS - Albert Chan - 03-13-2020 06:30 PM

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