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**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,797
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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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'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'

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,401

Hi;

**In mathematics, you don't understand things. You just get used to them.I have the result, but I do not yet know how to get it.All physicists, and a good many quite respectable mathematicians are contemptuous about proof.**

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**muxdemux****Member**- Registered: 2012-12-23
- Posts: 80

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

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**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,797
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1=Agnishom, Bobbym

2=

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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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,401

Hi;

**In mathematics, you don't understand things. You just get used to them.I have the result, but I do not yet know how to get it.All physicists, and a good many quite respectable mathematicians are contemptuous about proof.**

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**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
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3=

4=

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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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,401

Hi julianthemath;

I think you mean for 5

**In mathematics, you don't understand things. You just get used to them.I have the result, but I do not yet know how to get it.All physicists, and a good many quite respectable mathematicians are contemptuous about proof.**

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**muxdemux****Member**- Registered: 2012-12-23
- Posts: 80

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

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**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,797
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5=11

6=625

Muxdemux, sorry about that.

Bobbym, I don't mean that!

Muxdemux, I think that is not correct in 6.

Anyways,

7. log3(___)=5

8. log6(64)=__

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

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**muxdemux****Member**- Registered: 2012-12-23
- Posts: 80

I think bobby is right, man.

but .I'm getting

and for Q7 and Q8, respectively.Offline

**scientia****Member**- Registered: 2009-11-13
- Posts: 222

@julianthemath

The correct formula is , not log[sub]

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**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,797
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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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**muxdemux****Member**- Registered: 2012-12-23
- Posts: 80

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

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**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,797
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I am a bit shy! Just make a similar thread to this and I will join your topic.

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

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,401

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.

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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

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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**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,797
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Whoops!

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

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