I need help finding complex roots

03282020, 04:59 PM
Post: #1




I need help finding complex roots
Hi all. I'm very new to HP Prime and I've tried to do my research about my question, but everything I try doesn't work.
I'm trying to find roots of a Quadratic formula. I can't find out how to do it. Example: x^2+2x+5=0 this is the answer i'm hoping to see from the calculator: x = 1 + 2i or x = 1  2i I have tried Toolbox>Polynomial>Find Roots (and it gave me 2 as an answer?) Toolbox>Solve>Solve, Zeros, Complex Solve, Complex Zeros Nothing is giving me the answer I want. What am I missing? Why would proot only give me one answer? Thanks so much for your time! 

03282020, 05:39 PM
Post: #2




RE: I need help finding complex roots  
03282020, 06:23 PM
Post: #3




RE: I need help finding complex roots
Are you using [CAS] for this?


03292020, 05:36 PM
Post: #4




RE: I need help finding complex roots
Hi, under CAS, csolve should also have worked fine (in addition to proof). If you set "Use I" (to factor polynomials) in CAS settings, then solve also works fine under the latest version.


03292020, 07:09 PM
(This post was last modified: 03292020 07:11 PM by rrpalma.)
Post: #5




RE: I need help finding complex roots
(03282020 04:59 PM)freyabelle Wrote: Hi all. I'm very new to HP Prime and I've tried to do my research about my question, but everything I try doesn't work. Make sure you have "Complex" enabled on the CAS settings. I just tried your equation, and yes, you do get an empty set as an answer if Complex is not enabled. But you do get your expected, correct answers if you set the Complex flag. 

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