We are asked to simplify the expression $3\log 8 - 3\log 6$ and express the result as a single logarithm. We assume the logarithm is base 10.

AlgebraLogarithmsLogarithm PropertiesSimplification
2025/4/23

1. Problem Description

We are asked to simplify the expression 3log83log63\log 8 - 3\log 6 and express the result as a single logarithm. We assume the logarithm is base
1
0.

2. Solution Steps

First, we use the logarithm property alogx=logxaa\log x = \log x^a to rewrite the expression:
3log83log6=log83log633\log 8 - 3\log 6 = \log 8^3 - \log 6^3
83=8×8×8=5128^3 = 8 \times 8 \times 8 = 512
63=6×6×6=2166^3 = 6 \times 6 \times 6 = 216
Therefore, we have:
log83log63=log512log216\log 8^3 - \log 6^3 = \log 512 - \log 216
Next, we use the logarithm property logxlogy=logxy\log x - \log y = \log \frac{x}{y} to combine the logarithms:
log512log216=log512216\log 512 - \log 216 = \log \frac{512}{216}
We simplify the fraction 512216\frac{512}{216} by dividing both the numerator and the denominator by their greatest common divisor.
Both are divisible by 2:
512216=256108\frac{512}{216} = \frac{256}{108}
Both are divisible by 2:
256108=12854\frac{256}{108} = \frac{128}{54}
Both are divisible by 2:
12854=6427\frac{128}{54} = \frac{64}{27}
So, we have:
log512216=log6427\log \frac{512}{216} = \log \frac{64}{27}

3. Final Answer

log6427\log \frac{64}{27}

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