inexplicabale fault in CAS Mode

23102016, 12:52 PM
Post: #1




inexplicabale fault in CAS Mode
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 

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