Solve Quartic with Casio FX115MS

11292018, 10:31 PM
(This post was last modified: 08232019 11:48 PM by Albert Chan.)
Post: #2




RE: Solve Quartic with Casio FX115MS
(11292018 05:28 PM)Albert Chan Wrote: A trick to force Casio FX115MS to solve for D: 0ABC + B^2  4(2D  A)(D^2  C) Discover a simpler way to solve for D, without the 0ABC + ... hack B^2  4(2D  A)(D^2  C) [SOLVE] Enter the values like before, but scroll back to D= line before pressing [SOLVE] If A, B, C were values already stored, scroll directly to D=, enter guess, scroll up, then [SOLVE] If calculated D too small, below max(A/2, √C), press [SOLVE] again with higher guess. This was vaguely (if followed the keystrokes) stated in the manual ... Oh well Edit: although D can be solved with Cubic Solver, I worried about its bugs. Calculated D must be very accurate, otherwise all 4 roots will be bad. Without the bugs, Cubic Solver is easier. Just enter the coefficients: a = 8, b = 4A, c = 8C, d = B^24AC, we get x1 = 1.99130646 

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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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