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Mathematics

If log 27 = 1.431, find the value of :

(i) log 9

(ii) log 300

Logarithms

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Answer

Given,

⇒ log 27 = 1.431

⇒ log 33 = 1.431

⇒ 3 log 3 = 1.431

⇒ log 3 = 1.4313\dfrac{1.431}{3} = 0.477 …….(1)

(i) Solving,

⇒ log 9

⇒ log 32

⇒ 2 log 3

Substituting value of log 3 from equation (1) in above equation, we get :

⇒ 2 × 0.477

⇒ 0.954

Hence, log 9 = 0.954

(ii) Solving,

⇒ log 300

⇒ log 3 × 100

⇒ log 3 + log 100

⇒ 0.477 + log 102

⇒ 0.477 + 2 log 10

⇒ 0.477 + 2 × 1

⇒ 0.477 + 2

⇒ 2.477

Hence, log 300 = 2.477

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