Aptitude - Logarithm - Discussion
Discussion Forum : Logarithm - General Questions (Q.No. 6)
6.
| If log10 7 = a, then log10 |  |
1 |  |
is equal to: |
| 70 |
Answer: Option
Explanation:
|
= log10 1 - log10 70 | |||||
| = - log10 (7 x 10) | ||||||
| = - (log10 7 + log10 10) | ||||||
| = - (a + 1). |
Discussion:
33 comments Page 3 of 4.
Happiness said:
10 years ago
How comes, log 10 is 0 should not it be 0.01, please anyone?
Gosai devam said:
10 years ago
log 10(1) - log 10(70).
= 1-log 10(7*10).
-log 10(7)+log 10(10).
-a+1 answer.
= 1-log 10(7*10).
-log 10(7)+log 10(10).
-a+1 answer.
Tashi said:
1 decade ago
log 10 (1/7) = log10 -log10 70.
log10 1 = 0.
Therefore 0-log10 70.
-log10 70 = its same as -log10 (7*10).
-(log10 7+log10 10).
Given log10 7 = a.
And log10 10 equal to 1 = -(a+1).
Therefore Log10 (1/70) = -(a+1).
log10 1 = 0.
Therefore 0-log10 70.
-log10 70 = its same as -log10 (7*10).
-(log10 7+log10 10).
Given log10 7 = a.
And log10 10 equal to 1 = -(a+1).
Therefore Log10 (1/70) = -(a+1).
Vinayak said:
1 decade ago
As we know that,
log 10 1 = 0.
And
log x x =1.
log 10 (1/70)=log 10 1 - log 10 70.
= 0 - log 10 70.
= - log 10 (7*10).
= -(log 1o 7 + log 10 10).
= -(a+1).
Because log10 7 = a is given and log x x =1.
log 10 1 = 0.
And
log x x =1.
log 10 (1/70)=log 10 1 - log 10 70.
= 0 - log 10 70.
= - log 10 (7*10).
= -(log 1o 7 + log 10 10).
= -(a+1).
Because log10 7 = a is given and log x x =1.
Tanmay Mishra said:
1 decade ago
How we got last step:
= - (log10 7 + log10 10)
= - (a + 1)
= - (log10 7 + log10 10)
= - (a + 1)
Swathi said:
1 decade ago
(log m-log n) is log(m\n) so we get log(70\1) tat is log(70) which can be written as log(7*10)
Majnu said:
1 decade ago
Is log10 1 Zero...?
Shalini said:
1 decade ago
We know that.
Log 1= 0.
Put this value in 1st step we get.
0-log 70.
Log 1= 0.
Put this value in 1st step we get.
0-log 70.
Gyan said:
1 decade ago
How do you get second step here ?
Buncy said:
1 decade ago
How did you got the second step?
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