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 1 of 4.
Shraddha Patel said:
3 years ago
Thanks for the explanation @Rohit.
(2)
Ademani Thomas said:
3 years ago
What is log102 = 0.3010?
Please explain.
Please explain.
(1)
Giri said:
5 years ago
Thank you @Rohit.
(1)
Habib said:
5 years ago
Thanks @Rohit.
(1)
Akanthreddy said:
9 years ago
2 step = log 10 70 = we can write it has 10*7 = 70 so we get that 2 nd step.
Nkayagwa Issa said:
9 years ago
Given,
Log7 = a,
Required to find = log10(1/70)
From logarithim of quotient,
Loga/b = loga - logb,
Therefore, log10(1/70) = log1 - log70.
= 0 - log70.
Since;
Any number to power one is 0 (logs laws).
= - log(10 + 7).
= -(1 + a).
Therefore, = -(1 + a). Because log7 is already given which is a and log10 = 1.
Log7 = a,
Required to find = log10(1/70)
From logarithim of quotient,
Loga/b = loga - logb,
Therefore, log10(1/70) = log1 - log70.
= 0 - log70.
Since;
Any number to power one is 0 (logs laws).
= - log(10 + 7).
= -(1 + a).
Therefore, = -(1 + a). Because log7 is already given which is a and log10 = 1.
Abdul bari said:
9 years ago
log 10 (-1) = ?
Please solve and tell me the answer.
Please solve and tell me the answer.
Shreyash said:
9 years ago
@Abdul.
Log of negative number is not defines.
Log of negative number is not defines.
Subhajit said:
8 years ago
How to -log10(7*10)?
Dev said:
8 years ago
Please explain the second step. I didn't get it.
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