Algebra Examples

$\frac{1}{\log_{2} (12)} + \frac{1}{\log_{8} (12)} + \frac{1}{\log_{9} (12)}$

Step 1

To write $\frac{1}{\log_{2} (12)}$ as a fraction with a common denominator, multiply by $\frac{\log_{8} (12)}{\log_{8} (12)}$ .

$\frac{1}{\log_{2} (12)} \cdot \frac{\log_{8} (12)}{\log_{8} (12)} + \frac{1}{\log_{8} (12)} + \frac{1}{\log_{9} (12)}$

Step 2

To write $\frac{1}{\log_{8} (12)}$ as a fraction with a common denominator, multiply by $\frac{\log_{2} (12)}{\log_{2} (12)}$ .

$\frac{1}{\log_{2} (12)} \cdot \frac{\log_{8} (12)}{\log_{8} (12)} + \frac{1}{\log_{8} (12)} \cdot \frac{\log_{2} (12)}{\log_{2} (12)} + \frac{1}{\log_{9} (12)}$

Step 3

Write each expression with a common denominator of $\log_{2} (12) \log_{8} (12)$ , by multiplying each by an appropriate factor of $1$ .

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Step 3.1

Multiply $\frac{1}{\log_{2} (12)}$ by $\frac{\log_{8} (12)}{\log_{8} (12)}$ .

$\frac{\log_{8} (12)}{\log_{2} (12) \log_{8} (12)} + \frac{1}{\log_{8} (12)} \cdot \frac{\log_{2} (12)}{\log_{2} (12)} + \frac{1}{\log_{9} (12)}$

Step 3.2

Multiply $\frac{1}{\log_{8} (12)}$ by $\frac{\log_{2} (12)}{\log_{2} (12)}$ .

$\frac{\log_{8} (12)}{\log_{2} (12) \log_{8} (12)} + \frac{\log_{2} (12)}{\log_{8} (12) \log_{2} (12)} + \frac{1}{\log_{9} (12)}$

Step 3.3

Reorder the factors of $\log_{8} (12) \log_{2} (12)$ .

$\frac{\log_{8} (12)}{\log_{2} (12) \log_{8} (12)} + \frac{\log_{2} (12)}{\log_{2} (12) \log_{8} (12)} + \frac{1}{\log_{9} (12)}$

Step 4

Combine the numerators over the common denominator.

$\frac{\log_{8} (12) + \log_{2} (12)}{\log_{2} (12) \log_{8} (12)} + \frac{1}{\log_{9} (12)}$

Step 5

To write $\frac{\log_{8} (12) + \log_{2} (12)}{\log_{2} (12) \log_{8} (12)}$ as a fraction with a common denominator, multiply by $\frac{\log_{9} (12)}{\log_{9} (12)}$ .

$\frac{\log_{8} (12) + \log_{2} (12)}{\log_{2} (12) \log_{8} (12)} \cdot \frac{\log_{9} (12)}{\log_{9} (12)} + \frac{1}{\log_{9} (12)}$

Step 6

To write $\frac{1}{\log_{9} (12)}$ as a fraction with a common denominator, multiply by $\frac{\log_{2} (12) \log_{8} (12)}{\log_{2} (12) \log_{8} (12)}$ .

$\frac{\log_{8} (12) + \log_{2} (12)}{\log_{2} (12) \log_{8} (12)} \cdot \frac{\log_{9} (12)}{\log_{9} (12)} + \frac{1}{\log_{9} (12)} \cdot \frac{\log_{2} (12) \log_{8} (12)}{\log_{2} (12) \log_{8} (12)}$

Step 7

Write each expression with a common denominator of $\log_{2} (12) \log_{8} (12) \log_{9} (12)$ , by multiplying each by an appropriate factor of $1$ .

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Step 7.1

Multiply $\frac{\log_{8} (12) + \log_{2} (12)}{\log_{2} (12) \log_{8} (12)}$ by $\frac{\log_{9} (12)}{\log_{9} (12)}$ .

$\frac{(\log_{8} (12) + \log_{2} (12)) \log_{9} (12)}{\log_{2} (12) \log_{8} (12) \log_{9} (12)} + \frac{1}{\log_{9} (12)} \cdot \frac{\log_{2} (12) \log_{8} (12)}{\log_{2} (12) \log_{8} (12)}$

Step 7.2

Multiply $\frac{1}{\log_{9} (12)}$ by $\frac{\log_{2} (12) \log_{8} (12)}{\log_{2} (12) \log_{8} (12)}$ .

$\frac{(\log_{8} (12) + \log_{2} (12)) \log_{9} (12)}{\log_{2} (12) \log_{8} (12) \log_{9} (12)} + \frac{\log_{2} (12) \log_{8} (12)}{\log_{9} (12) (\log_{2} (12) \log_{8} (12))}$

Step 7.3

Reorder the factors of $\log_{9} (12) (\log_{2} (12) \log_{8} (12))$ .

$\frac{(\log_{8} (12) + \log_{2} (12)) \log_{9} (12)}{\log_{2} (12) \log_{8} (12) \log_{9} (12)} + \frac{\log_{2} (12) \log_{8} (12)}{\log_{2} (12) \log_{8} (12) \log_{9} (12)}$

Step 8

Combine the numerators over the common denominator.

$\frac{(\log_{8} (12) + \log_{2} (12)) \log_{9} (12) + \log_{2} (12) \log_{8} (12)}{\log_{2} (12) \log_{8} (12) \log_{9} (12)}$

Step 9

Apply the distributive property.

$\frac{\log_{8} (12) \log_{9} (12) + \log_{2} (12) \log_{9} (12) + \log_{2} (12) \log_{8} (12)}{\log_{2} (12) \log_{8} (12) \log_{9} (12)}$

Step 10

The result can be shown in multiple forms.

Exact Form:

$\frac{\log_{8} (12) \log_{9} (12) + \log_{2} (12) \log_{9} (12) + \log_{2} (12) \log_{8} (12)}{\log_{2} (12) \log_{8} (12) \log_{9} (12)}$

Decimal Form:

$2$