Solve Quartic with Casio FX115MS

02012020, 12:27 PM
(This post was last modified: 03132020 06:24 PM by Albert Chan.)
Post: #7




RE: Solve Quartic with Casio FX115MS
Found a Quartic Solver from https://thomasokken.com/free42/
It uses the same resolvent cubics as Brown's method, without sorting the roots. (08302019 02:02 PM)Albert Chan Wrote: Example: solve x^4 + 2 x^3 + 3 x^2 + 4 x + 5 = 0 Upto calculations of Y is identical E = √(A²/4  B + Y) = 1.575630959 F = √(Y²/4  D) = 0.153149095 → [c1,c2] = A/2 ± E = [2.575630959, 0.575630959] → [d1,d2] = Y/2 ∓ F = [2.088157364, 2.394455555] 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 

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Messages In This Thread 
Solve Quartic with Casio FX115MS  Albert Chan  11292018, 05:28 PM
RE: Solve Quartic with Casio FX115MS  Albert Chan  11292018, 10:31 PM
RE: Solve Quartic with Casio FX115MS  Albert Chan  02042019, 01:39 PM
RE: Solve Quartic with Casio FX115MS  Albert Chan  08242019, 12:47 PM
RE: Solve Quartic with Casio FX115MS  SlideRule  03142020, 01:28 AM
RE: Solve Quartic with Casio FX115MS  Albert Chan  08302019, 02:02 PM
RE: Solve Quartic with Casio FX115MS  Albert Chan  09022019, 02:35 PM
RE: Solve Quartic with Casio FX115MS  Albert Chan  02012020 12:27 PM
RE: Solve Quartic with Casio FX115MS  Albert Chan  03132020, 06:30 PM

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