Page 1 sur 1
solve logarithmic inequalities with hp prime and khicas
Publié : mar. janv. 02, 2018 12:19 pm
par Federico Di Ceglie
Goodmorning everyone,
Parisse, do you know why when I solve log2(3+x)+log2(3-x)>=1 hp prime otput x>=-sqrt(7) and x<=sqrt(7) and with Khicas output x>=-sqrt(-e^1+36)\2 and x<=sqrt(-e^1+36)\2?
Re: solve logarithmic inequalities with hp prime and khicas
Publié : jeu. janv. 04, 2018 7:43 am
par parisse
Can you enter the precise commandline (algebraic syntax)?
There is no log2 function in giac.
Re: solve logarithmic inequalities with hp prime and khicas
Publié : jeu. janv. 04, 2018 11:30 am
par Federico Di Ceglie
parisse a écrit :Can you enter the precise commandline (algebraic syntax)?
There is no log2 function in giac.
Both with prime and Khicas i use the template "log" of the two calculators, then I enter 2 as base of the logarithm.
Re: solve logarithmic inequalities with hp prime and khicas
Publié : jeu. janv. 04, 2018 12:27 pm
par parisse
The log template of the nspire is not recognized, try log_2(3.0) then enter. Use natural logarithm or logb(x,b) instead.
Re: solve logarithmic inequalities with hp prime and khicas
Publié : jeu. janv. 04, 2018 2:40 pm
par Federico Di Ceglie
parisse a écrit :The log template of the nspire is not recognized, try log_2(3.0) then enter. Use natural logarithm or logb(x,b) instead.
With logb(x,b) Works, thank you very much