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Pupino
- D J -

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Dubbi Primo compitino

Ho un dubbio su come risolvere questo esercizio:

Determinare il dominio di definizione, i limiti agli estremi del dominio e gli eventuali asintoti della seguente funzione:
g(x) = radice quadrata di x^2 -1 -4|x|


Come la impostate?

Io pensavo a un sistema del genere

code:
x>0 x<0 4x>=x^2-1 U -4x>=x^2-1


:help:

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23-04-2007 10:54
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manudanese
.primate.

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Registered: Aug 2006
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io farei così:
cond. di esistenza: x^2 -1 -4|x| >= 0

poi discussione sul modulo:

|x| = +x se x>=0
- x se x < 0

quindi faccio 2 sistemi

il primo:

x>=0
x^2 -1 -4x >= 0

il secondo

x<0
x^2 -1 +4x >= 0

23-04-2007 11:19
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Pupino
- D J -

User info:
Registered: Nov 2003
Posts: 4223 (0.54 al dì)
Location: Paese dei Balocchi
Corso: Buenos aires
Anno: 2008 :)
Time Online: 27 Days, 15:16:44 [...]
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Mi sembra piu sensato il tuo.... Grassie! :D


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PUPINO'S VIDEO
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FRANK JAY
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Last edited by Pupino on 24-04-2007 at 13:33

24-04-2007 13:04
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