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

mathaholic
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From: Juliania
Registered: 2012-11-29
Posts: 2,845
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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)


"Double the fun, double the thrill, double the coolness" - Julianthewiki

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

Agnishom
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From: The Complex Plane
Registered: 2011-01-29
Posts: 16,632
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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'
'Humanity is still kept intact. It remains within.' -Alokananda

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

bobbym
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From: Bumpkinland
Registered: 2009-04-12
Posts: 86,264

Re: Logarithm game!

Hi;


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

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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: Juliania
Registered: 2012-11-29
Posts: 2,845
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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)


"Double the fun, double the thrill, double the coolness" - Julianthewiki

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

bobbym
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From: Bumpkinland
Registered: 2009-04-12
Posts: 86,264

Re: Logarithm game!

Hi;


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

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

mathaholic
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From: Juliania
Registered: 2012-11-29
Posts: 2,845
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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


"Double the fun, double the thrill, double the coolness" - Julianthewiki

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

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,264

Re: Logarithm game!

Hi julianthemath;

I think you mean for 5


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

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

muxdemux
Member
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: Juliania
Registered: 2012-11-29
Posts: 2,845
Website

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)=__


"Double the fun, double the thrill, double the coolness" - Julianthewiki

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

muxdemux
Member
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: 222

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: Juliania
Registered: 2012-11-29
Posts: 2,845
Website

Re: Logarithm game!

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


"Double the fun, double the thrill, double the coolness" - Julianthewiki

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

muxdemux
Member
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
Member
From: Juliania
Registered: 2012-11-29
Posts: 2,845
Website

Re: Logarithm game!

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


"Double the fun, double the thrill, double the coolness" - Julianthewiki

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

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,264

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.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

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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
Member
From: Juliania
Registered: 2012-11-29
Posts: 2,845
Website

Re: Logarithm game!

Whoops!
tongue


"Double the fun, double the thrill, double the coolness" - Julianthewiki

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