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

mathaholic
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From: Juliania
Registered: 2012-11-29
Posts: 2,870
Website

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)


"What is the square root of 2? 1.4141592653589793238" Seriously, I thought it was that. Too round?
3.141592653589793238...

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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: 18,222
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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'
'You have made another human being happy. There is no greater accomplishment.' -bobbym

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

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 89,150

Re: Logarithm game!

Hi;


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

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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

muxdemux
Member
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: 2,870
Website

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)


"What is the square root of 2? 1.4141592653589793238" Seriously, I thought it was that. Too round?
3.141592653589793238...

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

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 89,150

Re: Logarithm game!

Hi;


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

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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

mathaholic
Member
From: Juliania
Registered: 2012-11-29
Posts: 2,870
Website

Re: Logarithm game!

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


"What is the square root of 2? 1.4141592653589793238" Seriously, I thought it was that. Too round?
3.141592653589793238...

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

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 89,150

Re: Logarithm game!

Hi julianthemath;

I think you mean for 5


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

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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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
Member
From: Juliania
Registered: 2012-11-29
Posts: 2,870
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)=__


"What is the square root of 2? 1.4141592653589793238" Seriously, I thought it was that. Too round?
3.141592653589793238...

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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
Member
From: Juliania
Registered: 2012-11-29
Posts: 2,870
Website

Re: Logarithm game!

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


"What is the square root of 2? 1.4141592653589793238" Seriously, I thought it was that. Too round?
3.141592653589793238...

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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: 2,870
Website

Re: Logarithm game!

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


"What is the square root of 2? 1.4141592653589793238" Seriously, I thought it was that. Too round?
3.141592653589793238...

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

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 89,150

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.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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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: 2,870
Website

Re: Logarithm game!

Whoops!
tongue


"What is the square root of 2? 1.4141592653589793238" Seriously, I thought it was that. Too round?
3.141592653589793238...

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