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Mathematics

Express the following as a single logarithm:

2log 3 - 12\dfrac{1}{2}log 16 + log 12

Logarithms

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Answer

Given,

2log 312log 24+log 22.32log 312×4×log 2+log 22+log 32log 32log 2+2log 2+log 32log 3 + log 33log 3log 33=log 27.\Rightarrow \text{2log 3} - \dfrac{1}{2}\text{log 2}^4 + \text{log 2}^2.3 \\[1em] \Rightarrow \text{2log 3} - \dfrac{1}{2} \times 4 \times \text{log 2} + \text{log 2}^2 + \text{log 3} \\[1em] \Rightarrow \text{2log 3} - 2\text{log 2} + 2\text{log 2} + \text{log 3} \\[1em] \Rightarrow \text{2log 3 + log 3} \\[1em] \Rightarrow \text{3log 3} \\[1em] \Rightarrow \text{log 3}^3 = \text{log 27}.

Hence, 2log 3 - 12\dfrac{1}{2}log 16 + log 12 = log 27.

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