Logaritemska funkcija Flashcards

1
Q

predpis logaritemske funkcije

A

f(x)=log(a) x

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2
Q

Logaritem je

A

predpis, ki vsakemu pozitivnemu realnemu

številu priredi natanko eno realno število.

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3
Q

logaritem je eksponent

A

s katerim potenciramo logaritemsko osnovo (a), da dobimo logaritmand (x)

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4
Q

Lastnosti logaritmandov

A

Za poljubna pozitivna števila x, y, a, c (a ≠ 1, c ≠ 1) veljajo naslednje lastnosti:
log(a) 1 = 0
log(a) a = 1
log(a) (a nax) = x

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5
Q

poznamo dve skupini logritemske funkcije

A
  • Če je osnova a > 1,

- Če je osnova a € (0, 1),

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6
Q

Če je osnova a > 1,

Logaritemska funkcija v tem primeru

A
  • narašča povsod, kjer je definirana, - ima ničlo pri x = 1,
  • ima navpično asimptoto y = 0,
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7
Q

Če je osnova a € (0, 1),

Logaritemska funkcija v tem primeru

A
  • pada povsod, kjer je definirana,
  • ima ničlo pri x = 1,
  • ima navpično asimptoto y = 0,
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