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HatTrick86
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Domanda Asintotici

rigaz sono in panico totale...

Mi potete spiegare perchè

per x-> +infinito ho che:
radice(x^2 - x) = x + o(x) ???


e come mai

per x->0 ho che:
radice(1+x) - 1 = x/2 ???


HELP!

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"And there goes the Challenger, being chased by the blue, blue meanies on wheels. The vicious traffic squad cars are after our lone driver, the last American hero, the electric centaur, the, the demi-god, the super driver of the golden west!"

09-07-2009 14:57
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sbin
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Re: Domanda Asintotici

nel primo caso devi raccogliere il membro che va più veloce all'infinito... quindi x^2 per il confronto fra infiniti.
Quindi, mettendo sotto radice, ti rimarrà un qualcosa che è asintotico ad x, oppure che è x+o(x)

Nel secondo caso devi usare il limite notevole: (1+z)^a-1=a*z

dove z è un qualcosa che tende a zero e l'esponente a in questo caso varrà 1/2.
Quindi, in questo caso, il limite propostoti sarà asintotico a x*(1/2), cioè x/2

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Non ho miti ne’ eroi..
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10-07-2009 10:04
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HatTrick86
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grazie... thank you very much indeed!

il secondo caso l'avevo capito nn mi ricordavo il limite notevole...per quanto riguarda il primo caso lo so che è da stupidi ma nn mi accorgevo che se trascuro la x e tengo solo la x^2 , sotto radice mi darà x ... eheheheh :-))))

grazie cmq!

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"And there goes the Challenger, being chased by the blue, blue meanies on wheels. The vicious traffic squad cars are after our lone driver, the last American hero, the electric centaur, the, the demi-god, the super driver of the golden west!"

10-07-2009 10:52
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sbin
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Di niente! :-)

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Non ho miti ne’ eroi..
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[L. Carboni]

10-07-2009 14:17
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