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)
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Sir please provide unit 3 geometry except chapter 7 because it is provided here