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#1 2012-12-30 19:29:46

mathaholic
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From: Earth
Registered: 2012-11-29
Posts: 3,020

Logarithm game!

If you don't know logarithms yet, please go here: http://www.mathsisfun.com/algebra/logarithms.html
Okay! Questions!
Fill in the blank.
1) log[sub]4[/sub](___)=3
2) log[sub]2[/sub](81)=__

Last edited by julianthemath (2012-12-30 19:31:15)


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#2 2012-12-30 22:16:16

Agnishom
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Re: Logarithm game!


'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
'But our love is like the wind. I can't see it but I can feel it.' -A Walk to remember

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#3 2012-12-31 02:09:33

bobbym
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From: Bumpkinland
Registered: 2009-04-12
Posts: 97,072

Re: Logarithm game!

Hi;


In mathematics, you don't understand things. You just get used to them.

If it ain't broke, fix it until it is.

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#4 2012-12-31 02:25:33

muxdemux
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Registered: 2012-12-23
Posts: 80

Re: Logarithm game!

Last edited by muxdemux (2012-12-31 02:25:56)

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#5 2012-12-31 12:01:06

mathaholic
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From: Earth
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Re: Logarithm game!

up 1=Agnishom, Bobbym
up 2=dunno
3) log[sub]3[/sub](8)=__
4) log[sub]__[/sub](64)=8

Last edited by julianthemath (2012-12-31 12:01:34)


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#6 2012-12-31 12:07:28

bobbym
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From: Bumpkinland
Registered: 2009-04-12
Posts: 97,072

Re: Logarithm game!

Hi;


In mathematics, you don't understand things. You just get used to them.

If it ain't broke, fix it until it is.

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#7 2012-12-31 12:10:56

mathaholic
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Re: Logarithm game!

up 3=dunno
up 4=dunno
Okay!
5. log[sub]2[/sub](121)=__
6. log[sub]4[/sub](___)=5


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#8 2012-12-31 12:13:59

bobbym
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From: Bumpkinland
Registered: 2009-04-12
Posts: 97,072

Re: Logarithm game!

Hi julianthemath;

I think you mean for 5


In mathematics, you don't understand things. You just get used to them.

If it ain't broke, fix it until it is.

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#9 2012-12-31 12:17:43

muxdemux
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Registered: 2012-12-23
Posts: 80

Re: Logarithm game!

Hey! What's wrong with my answer for 2? sad

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#10 2012-12-31 13:53:08

mathaholic
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From: Earth
Registered: 2012-11-29
Posts: 3,020

Re: Logarithm game!

up 5=11
up 6=625
Muxdemux, sorry about that. sad
Bobbym, I don't mean that! tongue
Muxdemux, I think that is not correct in 6. sad
Anyways,
7. log3(___)=5
8. log6(64)=__


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#11 2012-12-31 14:17:39

muxdemux
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Registered: 2012-12-23
Posts: 80

Re: Logarithm game!

I think bobby is right, man.

but
.

I'm getting

and
for Q7 and Q8, respectively.

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#12 2012-12-31 14:18:35

scientia
Member
Registered: 2009-11-13
Posts: 224

Re: Logarithm game!

@julianthemath


The correct formula is
, not log[sub]a[/sub](n[sup]a[/sup]) = n. This is what you seem to be confusing.

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#13 2012-12-31 16:15:15

mathaholic
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From: Earth
Registered: 2012-11-29
Posts: 3,020

Re: Logarithm game!

Okay, scientia. I might not do this well. Ask bobbym to close the thread.


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#14 2012-12-31 16:36:24

muxdemux
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Registered: 2012-12-23
Posts: 80

Re: Logarithm game!

Nah, come on! It's an easy mistake to make. Keep going! smile

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#15 2012-12-31 18:55:38

mathaholic
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From: Earth
Registered: 2012-11-29
Posts: 3,020

Re: Logarithm game!

I am a bit shy! Just make a similar thread to this and I will join your topic. smile


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#16 2013-01-01 01:40:17

bobbym
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From: Bumpkinland
Registered: 2009-04-12
Posts: 97,072

Re: Logarithm game!

Hi julianthemath;

Okay, scientia. I might not do this well. Ask bobbym to close the thread.

I will keep it open a bit longer in case you change your mind.


In mathematics, you don't understand things. You just get used to them.

If it ain't broke, fix it until it is.

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#17 2013-01-01 08:37:55

noelevans
Member
Registered: 2012-07-20
Posts: 236

Re: Logarithm game!

julianthemath,  Have you see the fact that

  logy       logx
x        = y         which is still true for any positive base b (not 1) and positive x and y? 

One might get some interesting variations on these log problems using this fact.


Writing "pretty" math (two dimensional) is easier to read and grasp than LaTex (one dimensional).
LaTex is like painting on many strips of paper and then stacking them to see what picture they make.

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#18 2013-01-02 12:26:06

mathaholic
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From: Earth
Registered: 2012-11-29
Posts: 3,020

Re: Logarithm game!

Whoops!
tongue


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