Problem

Which of the following statements is FALSE? $\log _{5}(0.2)=-1$ $\log _{4}(4096)=6$ $\log _{2}(3)=8$ $\log (100)=2$ $\log _{6}(1)=0$

Solution

Step 1 :We use the identity $a\log_b{x}=\log_b{x^a}$ and the definition of logarithm $\log_b{b}=1$ and $\log_b{1}=0$ to check each statement.

Step 2 :First, we check $\log _{5}(0.2)=-1$. We know that $0.2=\frac{1}{5}$, so $\log _{5}(0.2)=\log _{5}(\frac{1}{5})=\log _{5}(5^{-1})=-1$, which is TRUE.

Step 3 :Next, we check $\log _{4}(4096)=6$. We know that $4096=4^6$, so $\log _{4}(4096)=\log _{4}(4^6)=6$, which is TRUE.

Step 4 :Then, we check $\log _{2}(3)=8$. We know that $3\neq2^8$, so $\log _{2}(3)\neq8$, which is FALSE.

Step 5 :After that, we check $\log (100)=2$. We know that $100=10^2$, so $\log (100)=\log (10^2)=2$, which is TRUE.

Step 6 :Finally, we check $\log _{6}(1)=0$. We know that $1=6^0$, so $\log _{6}(1)=\log _{6}(6^0)=0$, which is TRUE.

Step 7 :So, the statement $\log _{2}(3)=8$ is FALSE.

From Solvely APP
Source: https://solvelyapp.com/problems/20043/

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