Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

You are not logged in.

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

mathaholic
Member
From: Earth
Registered: 2012-11-29
Posts: 3,247

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)

Mathaholic | 10th most active poster | Maker of the 350,000th post | Person | rrr's classmate

Offline

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

Agnishom
Real Member
From: Riemann Sphere
Registered: 2011-01-29
Posts: 24,427
Website

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

Offline

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

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 107,122

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

Offline

#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)

Offline

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

mathaholic
Member
From: Earth
Registered: 2012-11-29
Posts: 3,247

Re: Logarithm game!

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)

Mathaholic | 10th most active poster | Maker of the 350,000th post | Person | rrr's classmate

Offline

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

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 107,122

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

Offline

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

mathaholic
Member
From: Earth
Registered: 2012-11-29
Posts: 3,247

Re: Logarithm game!

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

Mathaholic | 10th most active poster | Maker of the 350,000th post | Person | rrr's classmate

Offline

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

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 107,122

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

Offline

#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?

Offline

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

mathaholic
Member
From: Earth
Registered: 2012-11-29
Posts: 3,247

Re: Logarithm game!

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)=__

Mathaholic | 10th most active poster | Maker of the 350,000th post | Person | rrr's classmate

Offline

#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.

Offline

#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.

Offline

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

mathaholic
Member
From: Earth
Registered: 2012-11-29
Posts: 3,247

Re: Logarithm game!

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

Mathaholic | 10th most active poster | Maker of the 350,000th post | Person | rrr's classmate

Offline

#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!

Offline

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

mathaholic
Member
From: Earth
Registered: 2012-11-29
Posts: 3,247

Re: Logarithm game!

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

Mathaholic | 10th most active poster | Maker of the 350,000th post | Person | rrr's classmate

Offline

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

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 107,122

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

Offline

#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.

Offline

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

mathaholic
Member
From: Earth
Registered: 2012-11-29
Posts: 3,247

Re: Logarithm game!

Whoops!

Mathaholic | 10th most active poster | Maker of the 350,000th post | Person | rrr's classmate

Offline