Casio fx115ES Plus

03162019, 04:50 PM
(This post was last modified: 11162019 10:53 PM by Albert Chan.)
Post: #21




RE: Casio fx115ES Plus
Recently purchased Casio FX115ES Plus (used). Discovered a minor Quadratic Solver bug.
Example: solve G(y) = 11713 y^2 + 5346 y + 610 = 0 Casio FX115MS Quad Solver => y = 0.228207974 ± 8.537522411e5 * I Casio FX115ES Quad Solver => y = −0.228207974 ± 8.537522474e5 * I What seems to happen is FX115ES solving: y^2 + 5346/11713 * y + 610/11713 = 0 Luckily, we can bypass the bug, by scaling z = 11713 y → solve z^2 + 5346 * z + 610*11713 = 0 → z = 2673 ± I → y = (2673 ± I)/11713 = Casio FX115MS result Update: unfortunately, cubic solver bug still there. Tried solving x^3 + 3000 x^2 + 3000170 x + 16000 = 0 Small root = 0.053330 59568, but solver gives +0.051330 69857 ??? 

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