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Disequazione esponenziale. . aiuto?
(0,01)^x - 7 (0,1)^x - 30 > 0
Grazie.
2 Answers
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- ?Lv 76 years agoFavorite Answer
(0,1)²ˣ-7*(0,1)ˣ-30>0
Poniamo t=(0,1)ˣ,
t²-7t-30>0 le radici del trinomio sono t=-3 V t=10
la disequazione è verificata per
t<-3 V t>10
Passando alla variabile iniziale
(0,1)ˣ<-3 Impossibile, gli esponenziali sono positivi
(0,1)ˣ>10
10-ˣ>10
-x>1
x<-1
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