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A teacher used the change of base formula to determine whether the equation below is correct.
[tex]\[
\left(\log_2 10\right)\left(\log_4 8\right)\left(\log_{10} 4\right) = 3
\][/tex]

Which statement explains whether the equation is correct?

A. The equation is correct since
[tex]\[
\begin{aligned}
\left(\log_2 10\right)\left(\log_4 8\right)\left(\log_{10} 4\right) & = \log(2 \cdot 10) \cdot \log(4 \cdot 8) \cdot \log(10 \cdot 4) \\
& = \log(20) \cdot \log(32) \cdot \log(40) \\
& = 3
\end{aligned}
\][/tex]

B. The equation is not correct since
[tex]\[
\left(\log_2 10\right)\left(\log_4 8\right)\left(\log_{10} 4\right) = \frac{\log 10}{\log 2} \cdot \frac{\log 8}{\log 4} \cdot \frac{\log 4}{\log 10}
\][/tex]


Sagot :

To determine whether the equation [tex]\(\left(\log _2 10\right)\left(\log _4 8\right)\left(\log _{10} 4\right)=3\)[/tex] is correct, let's calculate each logarithm individually and then multiply the results.

### Step-by-Step Calculation:

1. Calculate [tex]\(\log_2 10\)[/tex]:
By the change of base formula, we have:
[tex]\[ \log_2 10 = \frac{\log 10}{\log 2} \][/tex]
Numerically, this value is approximately:
[tex]\[ \log_2 10 \approx 3.3219280948873626 \][/tex]

2. Calculate [tex]\(\log_4 8\)[/tex]:
By the change of base formula, we have:
[tex]\[ \log_4 8 = \frac{\log 8}{\log 4} \][/tex]
Since [tex]\(8 = 2^3\)[/tex] and [tex]\(4 = 2^2\)[/tex], we can simplify [tex]\(\log_4 8\)[/tex] as:
[tex]\[ \log_4 8 = \frac{\log_2 8}{\log_2 4} = \frac{3}{2} = 1.5 \][/tex]

3. Calculate [tex]\(\log_{10} 4\)[/tex]:
By the change of base formula, we have:
[tex]\[ \log_{10} 4 = \frac{\log 4}{\log 10} \][/tex]
Numerically, this value is approximately:
[tex]\[ \log_{10} 4 \approx 0.6020599913279623 \][/tex]

4. Multiply the results:
Now we multiply all the calculated values:
[tex]\[ (\log_2 10) \times (\log_4 8) \times (\log_{10} 4) \approx 3.3219280948873626 \times 1.5 \times 0.6020599913279623 = 3.0 \][/tex]

### Conclusion:
Thus, we find that:
[tex]\[ (\log_2 10) \times (\log_4 8) \times (\log_{10} 4) = 3.0 \][/tex]
Therefore, the equation is correct. This validates the statement as factually accurate.

The equation is correct since:
[tex]\[ (\log_2 10) \times (\log_4 8) \times (\log_{10} 4) = 3.0 \][/tex]
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