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Mathematics

If 3(log 5 - log 3) - (log 5 - 2 log 6) = 2 - log x, find x.

Logarithms

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Answer

Given,

⇒ 3(log 5 - log 3) - (log 5 - 2 log 6) = 2 - log x

⇒ 3log 5 - 3log 3 - log 5 + 2 log 6 = 2 - log x

⇒ 2log 5 - 3log 3 + 2log 6 = 2 - log x

⇒ 2log 5 - log 33 + log 62 = 2 - log x

⇒ log 52 - log 27 + log 36 + log x = 2

⇒ log 25 + log 36 + log x - log 27 = 2

⇒ log 25×36×x27\dfrac{25 \times 36 \times x}{27} = 2

100x3=102\dfrac{100x}{3} = 10^2

⇒ 100x = 3 × 102

⇒ 100x = 300

⇒ x = 300100\dfrac{300}{100} = 3.

Hence, x = 3.

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