HP Prime Solve command at expFkt. often does not work

04052019, 06:15 PM
Post: #1




HP Prime Solve command at expFkt. often does not work
Hello,
I have big problems solving exponential equations in CAS mode with the Solve command. 1 E.g. the equation (x^216)*exp(0,5*x) has x1=4 and x2=4 as solution. I don't get a solution from Prime. It works very well (x^216)exp(x), it even works with a fraction instead of 0,5, but not with 0,5. I have tried a lot and have no idea anymore. What am I doing wrong? best regards Jürgen 

04062019, 05:31 AM
Post: #2




RE: HP Prime Solve command at expFkt. often does not work
(x^216)*exp(0.5*x) is an approx equation because 0.5 is an approx number, you can solve it with the approx solver:
fsolve((x^216)*exp(0.5*x)) If you want to use the exact solver, convert 0.5 to an exact coefficient and run solve: solve((x^216)*exp(1/2*x)) 

04072019, 09:30 AM
Post: #3




RE: HP Prime Solve command at expFkt. often does not work
Thank you very much for your answer!
Yes, fsolve finally solves it, but only under protest with a strange error message. The command Zero again leads to no result. With parameters it gets even worse, example follows... kindly regards 

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