Aptitude - Logarithm - Discussion

Discussion :: Logarithm - General Questions (Q.No.3)

3. 

log 8 is equal to:
log 8

[A].
1
8
[B].
1
4
[C].
1
2
[D].
1
8

Answer: Option C

Explanation:

log 8 = log (8)1/2 = log 8 = 1 .
log 8 log 8 log 8 2

Desmond Akatugba said: (Apr 14, 2011)  
pls explain further i dont really understand this

Shalini said: (Sep 3, 2011)  
If given log m raise to the power n then power comes before log.

(i.e) we can write it as : n log m.

Gourav said: (Sep 28, 2013)  
Property of log is used i.e log m raise to power n miss @Shalimi is right. Work on some more problem on log like change of base formula which is very high end.

Jayati said: (Oct 16, 2013)  
Can we cut log 8 from the denominator and numerator? referring to last step.

Ramme said: (Sep 5, 2014)  
Why we can't put like this log 8 = log root(8) * log root(8) ?

Ruhul Amin Ahmed said: (Oct 20, 2014)  
We know that,

log(8)^1/2 = log8/2.

So, answers is 1/2.

Uday said: (Nov 5, 2014)  
2 log 15/2-log 25/81+3 log 2/9 = log2 solve.

Vennesa Bada said: (Sep 7, 2015)  
@Rahul Amin Ahmed.

log 8^(1/2) = not log8/2.

Keerthivasan said: (Sep 11, 2015)  
How to find log value?

Kushal said: (Sep 24, 2015)  
What is antilog?

Dishallar said: (Jun 29, 2016)  
Please help me with these logarithms given that log 3 = M.

a) m+n as a logarithm of single number.

b) log 9 in terms of m.

c) log2 1/4 interms of m&n.

Dishallar said: (Jun 29, 2016)  
Given that log 2= 0,3010 and 3 = 0,4771.

Evaluate,

a) Log 2, 25.

b) Square root of log 60.

Sindhuja said: (May 4, 2017)  
I am not getting this. Please explain it clearly.

Shubham Kumar Singh said: (Jul 18, 2017)  
I am not getting this. Please explain me clearly.

Abbhiranjan Singh said: (Jul 19, 2017)  
2 concept goes here.

1. You can write root 8 in terms of power i.e 8^(1/2) then 1/2 is multiplied and now the term is (1/2)log8/log8 here many people think that log8/log8 cancel but this thing doesn't happen log cannot be cancelled.

So we have to use the formula i.e, loga/logb i.e log(a-b) so here log( 8-8) gives the result log0 and value of log 0 is 1 so when 1 is multiplied with 1/2 it is 1/2.

Satyabrata Panda said: (Apr 25, 2018)  
Thank you all for explaining it.

Ananya Neogi said: (Jul 26, 2018)  
It is not clear to me. Please explain the answer in clear.

Husain said: (Feb 9, 2019)  
=Log√8/Log8.
=0.4515/0.9030,
=0.5,
=1/2.

Post your comments here:

Name *:

Email   : (optional)

» Your comments will be displayed only after manual approval.