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

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

(1) Give an equivalent exponential form for each statement:

(i) log2 8 = 3

(ii) log3 81 = 4

(iii) log2 ½ = -1

(iv) log5 1/25 = -2

(v) ½ = log4 2

(vi) 1/3 = log27 3

Solution: (2) Give an equivalent logarithmic form for each statement

(i) 16 = 24

Or, log2 16 = 4

(ii) 25 = 52

Or, log5 25 = 2

(iii) 81 = 34

Or, log3 81 = 4

(iv) 60 = 1

(v) 81/3

(vi) 1/9 = 3-2

(vii) 1/32 = 2-5

(viii) 101.4969 = 31.4

Solution: (3) Find the value of each logarithms given below:  (v) log10 100 = x

Or, 10x = 102

X = 2

(vi) log2 0.5 = x

2x = 0.5 = 5/10 = ½ = 2-1

(5) log10x = a

10a = x (True)

Updated: November 20, 2019 — 1:07 pm

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If possible can u provide solutions for all chapters all exercises in textbook

1. Ok

2. Please provide chapter 6th Indicis / constant

3. 4. 