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**mathaholic****Member**- From: Earth
- Registered: 2012-11-29
- Posts: 3,251

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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'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'

I'm not crazy, my mother had me tested.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,648

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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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: Earth
- Registered: 2012-11-29
- Posts: 3,251

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)*

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,648

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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**mathaholic****Member**- From: Earth
- Registered: 2012-11-29
- Posts: 3,251

3=

4=

Okay!

5. log[sub]2[/sub](121)=__

6. log[sub]4[/sub](___)=5

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,648

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.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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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: Earth
- Registered: 2012-11-29
- Posts: 3,251

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)=__

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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: 224

@julianthemath

The correct formula is , not log[sub]

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**mathaholic****Member**- From: Earth
- Registered: 2012-11-29
- Posts: 3,251

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

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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: Earth
- Registered: 2012-11-29
- Posts: 3,251

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

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,648

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.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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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: Earth
- Registered: 2012-11-29
- Posts: 3,251

Whoops!

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