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Simplify the following expression using the change of base formula: log12 7. Round to the nearest hundredth.

Simplify the following expression using the change of base formula: log12 7. Round-example-1
User Cone
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1 Answer

5 votes

Answer:

The expression is given below as


\log_(12)7

Let the expression above be equal to x


\log_(12)7=x

Concept:

Apply the logarithm change of base formula below


\begin{gathered} \log_aB=x \\ B=a^x \end{gathered}

By applying the concept above we will have


\begin{gathered} \operatorname{\log}_(12)7=x \\ 12^x=7 \\ take\text{ ln of both sides } \\ ln12^x=ln7 \\ xln12=ln7 \\ divide\text{ both sides by ln 12} \\ (xln12)/(ln12)=(ln7)/(ln12) \\ x=(ln7)/(ln12) \\ x=0.7831 \\ x\approx0.78\left(nearest\text{ hundredth\rparen}\right? \end{gathered}

Hence,

The final answer is


\Rightarrow0.78

User Eyal Leshem
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