If \log_10 7 = a, then find the value of \log_10 (1/ 70).

Logarithms Practice Test 1

Question : 30 of 40

Marks: +1, -0

\log_10 7 = a

, then find the value of

\log_10 (1/ 70)

Solution:

\log_10 (1/ 70)=\log_10 1-\log_10 70

=0-\log_10 (10×7)

= -\log_10 10 - \log_10 7

= -1-a = - (a + 1)

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