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      Question

      log (402- 202) is equal to

      A log 3 Correct Answer Incorrect Answer
      B log 60 + log 20 Correct Answer Incorrect Answer
      C log 40 – log 20 Correct Answer Incorrect Answer
      D log 20 Correct Answer Incorrect Answer

      Solution

      Considering the given equation log (402 - 202) ⇒ (402 - 202) = (40 + 20) (40 - 20) ⇒ (402 - 202) = 60 × 20 Now, log (402 - 202) = log (60 × 20) ⇒ log (60 × 20) = log 60 + log 20 ∴ Required value is log 60 + log 20

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