S Chand ICSE Mathematics Class 9 Solution Seventh Chapter Logarithms Exercise 7B (O.P. Malhotra, S.K. Gupta, Anubhuti Gangal)

S Chand ICSE Mathematics Class 9 Solution Seventh Chapter Logarithms Exercise 7B

(1) Express each sum or difference as a single logarithm.

(i) log 6 + log 5

= log (6 x 5) = log30

(ii) log 12 – log 2

= log (12/2)

= log6

(iii) log3 5 + log3 2 + log3 4

= log3 (5 x 2 x 4)

= log3 40

(iv) log2 12 – log2 2 + log2 5

= log2 (12 x 5 ÷ 2)

= log2 30

(5) log10 n + log10 5 = 1

(ii) log3 n – log3 4 = 2

(iii) log6 n – log6 (n-1) = log6 3

(iv) 2 log x = 4 log 3

Solution:

(6) (i) log10 5 + log102

= log10(5 x 2)

= log1010

= 1

(ii) log10 4 + log10 5 + log10 2

= log10 20 – log10 2

= log10 20 – log10 2

= log10 (20/2)

= log10 10

= 1


2 Comments

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  1. Pls provide solutions of missing chapter’s it’s urgent

    1. We are trying our level best for the solutions of the remaining chapters

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