S Chand ICSE Mathematics Class 9 Solution Seventh Chapter Logarithm Exercise 7C
If log 2 = 0.3010, log 3 = 0.4771, log 5 = 0.6990, log 7 = 0.8451 and log 11 = 1.0414, find the following:
(1) log 6
(2) log 12
(3) log 15
(4) log 200
(5) log 36
(6) log 80
(7) log 2 and 1/3
(8) log 113
(9) log (2 and 1/3)5
Solution:
(10) I f log 6 = 0.7782, find the value of log 36.
(11) Given log10 25 = x, log10 75 = y, evaluate without using logarithmic tables, in terms x, y
(i) log103
(ii) log102
Solution:
(12) Given log 31.87 = x, write down in terms of x:
(i) log (31.87)2
(ii) log10 0.03187
(iii) log10 √31870
(13) Solve the equation:
(i) log10 (x + 1) + log10 (x – 1) = log10 11 + 2 log103
(ii) log (10x + 5) – log (x – 4) = 2
Solution:
(28) If x2 + y2 = 51xy, prove that
Log x – y / 7 = ½ (log x + log y)
Solution:
Sir explain the chapter relational and irrational number