Lewis Li
08/29/2024 · High School
Q2: Use properties of logarithms to expand the expression \( \log \left(\frac{x^{4} z^{2}}{100 y^{3}}\right) \) as much as possible.
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Step-by-step Solution
To expand the expression \( \log \left(\frac{x^{4} z^{2}}{100 y^{3}}\right) \) using properties of logarithms, we can apply the following properties:
1. The logarithm of a quotient:
\[
\log \left(\frac{a}{b}\right) = \log(a) - \log(b)
\]
2. The logarithm of a product:
\[
\log(ab) = \log(a) + \log(b)
\]
3. The logarithm of a power:
\[
\log(a^b) = b \log(a)
\]
Now, we can apply these properties step by step:
1. Start with the quotient:
\[
\log \left(\frac{x^{4} z^{2}}{100 y^{3}}\right) = \log(x^{4} z^{2}) - \log(100 y^{3})
\]
2. Expand \( \log(x^{4} z^{2}) \) using the product property:
\[
\log(x^{4} z^{2}) = \log(x^{4}) + \log(z^{2})
\]
3. Now, apply the power property:
\[
\log(x^{4}) = 4 \log(x) \quad \text{and} \quad \log(z^{2}) = 2 \log(z)
\]
So,
\[
\log(x^{4} z^{2}) = 4 \log(x) + 2 \log(z)
\]
4. Next, expand \( \log(100 y^{3}) \):
\[
\log(100 y^{3}) = \log(100) + \log(y^{3})
\]
5. Again, apply the power property:
\[
\log(y^{3}) = 3 \log(y)
\]
And since \( 100 = 10^2 \), we have:
\[
\log(100) = \log(10^2) = 2 \log(10) = 2
\]
(assuming the logarithm is base 10).
6. Therefore,
\[
\log(100 y^{3}) = 2 + 3 \log(y)
\]
Now, putting it all together:
\[
\log \left(\frac{x^{4} z^{2}}{100 y^{3}}\right) = (4 \log(x) + 2 \log(z)) - (2 + 3 \log(y))
\]
7. Finally, simplify:
\[
\log \left(\frac{x^{4} z^{2}}{100 y^{3}}\right) = 4 \log(x) + 2 \log(z) - 2 - 3 \log(y)
\]
Thus, the expanded expression is:
\[
\log \left(\frac{x^{4} z^{2}}{100 y^{3}}\right) = 4 \log(x) + 2 \log(z) - 3 \log(y) - 2
\]
Quick Answer
The expanded expression is \( 4 \log(x) + 2 \log(z) - 3 \log(y) - 2 \).
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