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Fill in the missing values to make the equations true.

(a) [tex]\log_2 11 + \log_2 9 = \log_2 \square[/tex]

(b) [tex]\log_9 8 - \log_9 \square = \log_9 \frac{8}{11}[/tex]

(c) [tex]\log_3 4 = \square \log_3 2[/tex]


Sagot :

Certainly! Let's work through these logarithmic equations one by one.

### Part (a)
Given: [tex]\(\log_2 11 + \log_2 9 = \log_2 \square\)[/tex]

We use the product rule for logarithms, which states:
[tex]\[ \log_b(m) + \log_b(n) = \log_b(m \cdot n) \][/tex]

Here, [tex]\( \log_2 11 + \log_2 9 \)[/tex] can be written as:
[tex]\[ \log_2 (11 \cdot 9) \][/tex]

Therefore, the value of the square is:
[tex]\[ 11 \cdot 9 = 99 \][/tex]

So,
[tex]\[ \log_2 11 + \log_2 9 = \log_2 99 \][/tex]

### Part (b)
Given: [tex]\(\log_9 8 - \log_9 \square = \log_9 \frac{8}{11}\)[/tex]

We use the quotient rule for logarithms, which states:
[tex]\[ \log_b(m) - \log_b(n) = \log_b \left(\frac{m}{n}\right) \][/tex]

Here, [tex]\(\log_9 8 - \log_9 \square\)[/tex] can be written as:
[tex]\[ \log_9 \left(\frac{8}{\square}\right) \][/tex]

Matching this with the given right-hand side of the equation, [tex]\(\log_9 \frac{8}{11}\)[/tex], it follows that:
[tex]\[ \square = 11 \][/tex]

So,
[tex]\[ \log_9 8 - \log_9 11 = \log_9 \frac{8}{11} \][/tex]

### Part (c)
Given: [tex]\(\log_3 4 = \square \log_3 2\)[/tex]

We use the change of base or properties of logarithms. Specifically, knowing that [tex]\(4 = 2^2\)[/tex], we can rewrite the expression using the power rule:
[tex]\[ \log_3 4 = \log_3 (2^2) \][/tex]

Using the power rule for logarithms, which states:
[tex]\[ \log_b (m^k) = k \log_b m \][/tex]

We get:
[tex]\[ \log_3 (2^2) = 2 \log_3 2 \][/tex]

So, the value of the square is:
[tex]\[ \square = 2 \][/tex]

Thus,
[tex]\[ \log_3 4 = 2 \log_3 2 \][/tex]

### Summary
Here are the missing values filled in:

(a) [tex]\(\log_2 11 + \log_2 9 = \log_2 99\)[/tex]

(b) [tex]\(\log_9 8 - \log_9 11 = \log_9 \frac{8}{11}\)[/tex]

(c) [tex]\(\log_3 4 = 2 \log_3 2\)[/tex]