inexplicabale fault in CAS Mode - Printable Version +- HP Prime Forum (http://forum.hp-prime.de) +-- Forum: HP Prime (/forumdisplay.php?fid=1) +--- Forum: Questions to HP (/forumdisplay.php?fid=3) +--- Thread: inexplicabale fault in CAS Mode (/showthread.php?tid=183) inexplicabale fault in CAS Mode - Martin Ünal - 23-10-2016 12:52 PM Hello everyone, since I come from Germany, my English isn't perfect. Sorry for that! I just encountered the following Problem: I wanted the HP Prime to calculate the roots (is it the right english word? the values of x_0 for which f(x_0) = 0) of f(x) = x^4 - 3x^3 - 2.75x² + 12x - 5 which are 2.5, -2, 2, and 0.5. In the CAS mode, I entered zeros(x^4 - 3x^3 - 2.75x² + 12x - 5) an got the Output [2.5 2. -2. 0] 0 is obviously not a root of this polynomial. Where is the mistake? On my side (and which one?) or on the HP Prime's side (and can it be fixed?)? I would like to tell you my HP Prime's software version but I don't know how to find it out. Can someone tell me? I have the same problem when I use the HP Prime Virtual Calculator on my Computer (the 2016_08_29 version). Thank you for your answers! Martin RE: inexplicabale fault in CAS Mode - JMB - 02-01-2018 04:51 PM My HP Prime calculator with FW 12066 also gives a wrong answer, but I have the HP Prime Virtual Calculator with the last beta FW 13217 and it gives the correct answer [2.5 2. -2 0.5]. So, it looks like HP has solved this bug and we'll only have to wait for the final version to be deployed.