Precalculus Examples

$\frac{1}{2 \ln (2)} - \frac{1}{3 \ln (3)} + \frac{1}{4 \ln (4)} - \frac{1}{5 \ln (5)}$

Step 1

Simplify each term.

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Step 1.1

Simplify $2 \ln (2)$ by moving $2$ inside the logarithm.

$\frac{1}{\ln (2^{2})} - \frac{1}{3 \ln (3)} + \frac{1}{4 \ln (4)} - \frac{1}{5 \ln (5)}$

Step 1.2

Raise $2$ to the power of $2$ .

$\frac{1}{\ln (4)} - \frac{1}{3 \ln (3)} + \frac{1}{4 \ln (4)} - \frac{1}{5 \ln (5)}$

Step 1.3

Simplify $3 \ln (3)$ by moving $3$ inside the logarithm.

$\frac{1}{\ln (4)} - \frac{1}{\ln (3^{3})} + \frac{1}{4 \ln (4)} - \frac{1}{5 \ln (5)}$

Step 1.4

Raise $3$ to the power of $3$ .

$\frac{1}{\ln (4)} - \frac{1}{\ln (27)} + \frac{1}{4 \ln (4)} - \frac{1}{5 \ln (5)}$

Step 1.5

Simplify $4 \ln (4)$ by moving $4$ inside the logarithm.

$\frac{1}{\ln (4)} - \frac{1}{\ln (27)} + \frac{1}{\ln (4^{4})} - \frac{1}{5 \ln (5)}$

Step 1.6

Raise $4$ to the power of $4$ .

$\frac{1}{\ln (4)} - \frac{1}{\ln (27)} + \frac{1}{\ln (256)} - \frac{1}{5 \ln (5)}$

Step 1.7

Simplify $5 \ln (5)$ by moving $5$ inside the logarithm.

$\frac{1}{\ln (4)} - \frac{1}{\ln (27)} + \frac{1}{\ln (256)} - \frac{1}{\ln (5^{5})}$

Step 1.8

Raise $5$ to the power of $5$ .

$\frac{1}{\ln (4)} - \frac{1}{\ln (27)} + \frac{1}{\ln (256)} - \frac{1}{\ln (3125)}$

Step 2

To write $\frac{1}{\ln (4)}$ as a fraction with a common denominator, multiply by $\frac{\ln (27)}{\ln (27)}$ .

$\frac{1}{\ln (4)} \cdot \frac{\ln (27)}{\ln (27)} - \frac{1}{\ln (27)} + \frac{1}{\ln (256)} - \frac{1}{\ln (3125)}$

Step 3

To write $- \frac{1}{\ln (27)}$ as a fraction with a common denominator, multiply by $\frac{\ln (4)}{\ln (4)}$ .

$\frac{1}{\ln (4)} \cdot \frac{\ln (27)}{\ln (27)} - \frac{1}{\ln (27)} \cdot \frac{\ln (4)}{\ln (4)} + \frac{1}{\ln (256)} - \frac{1}{\ln (3125)}$

Step 4

Write each expression with a common denominator of $\ln (4) \ln (27)$ , by multiplying each by an appropriate factor of $1$ .

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Step 4.1

Multiply $\frac{1}{\ln (4)}$ by $\frac{\ln (27)}{\ln (27)}$ .

$\frac{\ln (27)}{\ln (4) \ln (27)} - \frac{1}{\ln (27)} \cdot \frac{\ln (4)}{\ln (4)} + \frac{1}{\ln (256)} - \frac{1}{\ln (3125)}$

Step 4.2

Multiply $\frac{1}{\ln (27)}$ by $\frac{\ln (4)}{\ln (4)}$ .

$\frac{\ln (27)}{\ln (4) \ln (27)} - \frac{\ln (4)}{\ln (27) \ln (4)} + \frac{1}{\ln (256)} - \frac{1}{\ln (3125)}$

Step 4.3

Reorder the factors of $\ln (4) \ln (27)$ .

$\frac{\ln (27)}{\ln (27) \ln (4)} - \frac{\ln (4)}{\ln (27) \ln (4)} + \frac{1}{\ln (256)} - \frac{1}{\ln (3125)}$

Step 5

Combine the numerators over the common denominator.

$\frac{\ln (27) - \ln (4)}{\ln (27) \ln (4)} + \frac{1}{\ln (256)} - \frac{1}{\ln (3125)}$

Step 6

Use the quotient property of logarithms, $\log_{b} (x) - \log_{b} (y) = \log_{b} (\frac{x}{y})$ .

$\frac{\ln (\frac{27}{4})}{\ln (27) \ln (4)} + \frac{1}{\ln (256)} - \frac{1}{\ln (3125)}$

Step 7

To write $\frac{\ln (\frac{27}{4})}{\ln (27) \ln (4)}$ as a fraction with a common denominator, multiply by $\frac{\ln (256)}{\ln (256)}$ .

$\frac{\ln (\frac{27}{4})}{\ln (27) \ln (4)} \cdot \frac{\ln (256)}{\ln (256)} + \frac{1}{\ln (256)} - \frac{1}{\ln (3125)}$

Step 8

To write $\frac{1}{\ln (256)}$ as a fraction with a common denominator, multiply by $\frac{\ln (27) \ln (4)}{\ln (27) \ln (4)}$ .

$\frac{\ln (\frac{27}{4})}{\ln (27) \ln (4)} \cdot \frac{\ln (256)}{\ln (256)} + \frac{1}{\ln (256)} \cdot \frac{\ln (27) \ln (4)}{\ln (27) \ln (4)} - \frac{1}{\ln (3125)}$

Step 9

Write each expression with a common denominator of $\ln (27) \ln (4) \ln (256)$ , by multiplying each by an appropriate factor of $1$ .

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Step 9.1

Multiply $\frac{\ln (\frac{27}{4})}{\ln (27) \ln (4)}$ by $\frac{\ln (256)}{\ln (256)}$ .

$\frac{\ln (\frac{27}{4}) \ln (256)}{\ln (27) \ln (4) \ln (256)} + \frac{1}{\ln (256)} \cdot \frac{\ln (27) \ln (4)}{\ln (27) \ln (4)} - \frac{1}{\ln (3125)}$

Step 9.2

Multiply $\frac{1}{\ln (256)}$ by $\frac{\ln (27) \ln (4)}{\ln (27) \ln (4)}$ .

$\frac{\ln (\frac{27}{4}) \ln (256)}{\ln (27) \ln (4) \ln (256)} + \frac{\ln (27) \ln (4)}{\ln (256) (\ln (27) \ln (4))} - \frac{1}{\ln (3125)}$

Step 9.3

Reorder the factors of $\ln (27) \ln (4) \ln (256)$ .

$\frac{\ln (\frac{27}{4}) \ln (256)}{\ln (256) \ln (27) \ln (4)} + \frac{\ln (27) \ln (4)}{\ln (256) (\ln (27) \ln (4))} - \frac{1}{\ln (3125)}$

Step 9.4

Reorder the factors of $\ln (256) (\ln (27) \ln (4))$ .

$\frac{\ln (\frac{27}{4}) \ln (256)}{\ln (256) \ln (27) \ln (4)} + \frac{\ln (27) \ln (4)}{\ln (256) \ln (27) \ln (4)} - \frac{1}{\ln (3125)}$

Step 10

Combine the numerators over the common denominator.

$\frac{\ln (\frac{27}{4}) \ln (256) + \ln (27) \ln (4)}{\ln (256) \ln (27) \ln (4)} - \frac{1}{\ln (3125)}$

Step 11

To write $\frac{\ln (\frac{27}{4}) \ln (256) + \ln (27) \ln (4)}{\ln (256) \ln (27) \ln (4)}$ as a fraction with a common denominator, multiply by $\frac{\ln (3125)}{\ln (3125)}$ .

$\frac{\ln (\frac{27}{4}) \ln (256) + \ln (27) \ln (4)}{\ln (256) \ln (27) \ln (4)} \cdot \frac{\ln (3125)}{\ln (3125)} - \frac{1}{\ln (3125)}$

Step 12

To write $- \frac{1}{\ln (3125)}$ as a fraction with a common denominator, multiply by $\frac{\ln (256) \ln (27) \ln (4)}{\ln (256) \ln (27) \ln (4)}$ .

$\frac{\ln (\frac{27}{4}) \ln (256) + \ln (27) \ln (4)}{\ln (256) \ln (27) \ln (4)} \cdot \frac{\ln (3125)}{\ln (3125)} - \frac{1}{\ln (3125)} \cdot \frac{\ln (256) \ln (27) \ln (4)}{\ln (256) \ln (27) \ln (4)}$

Step 13

Write each expression with a common denominator of $\ln (256) \ln (27) \ln (4) \ln (3125)$ , by multiplying each by an appropriate factor of $1$ .

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Step 13.1

Multiply $\frac{\ln (\frac{27}{4}) \ln (256) + \ln (27) \ln (4)}{\ln (256) \ln (27) \ln (4)}$ by $\frac{\ln (3125)}{\ln (3125)}$ .

$\frac{(\ln (\frac{27}{4}) \ln (256) + \ln (27) \ln (4)) \ln (3125)}{\ln (256) \ln (27) \ln (4) \ln (3125)} - \frac{1}{\ln (3125)} \cdot \frac{\ln (256) \ln (27) \ln (4)}{\ln (256) \ln (27) \ln (4)}$

Step 13.2

Multiply $\frac{1}{\ln (3125)}$ by $\frac{\ln (256) \ln (27) \ln (4)}{\ln (256) \ln (27) \ln (4)}$ .

$\frac{(\ln (\frac{27}{4}) \ln (256) + \ln (27) \ln (4)) \ln (3125)}{\ln (256) \ln (27) \ln (4) \ln (3125)} - \frac{\ln (256) \ln (27) \ln (4)}{\ln (3125) (\ln (256) \ln (27) \ln (4))}$

Step 13.3

Reorder the factors of $\ln (256) \ln (27) \ln (4) \ln (3125)$ .

$\frac{(\ln (\frac{27}{4}) \ln (256) + \ln (27) \ln (4)) \ln (3125)}{\ln (256) \ln (27) \ln (3125) \ln (4)} - \frac{\ln (256) \ln (27) \ln (4)}{\ln (3125) (\ln (256) \ln (27) \ln (4))}$

Step 13.4

Reorder the factors of $\ln (3125) (\ln (256) \ln (27) \ln (4))$ .

$\frac{(\ln (\frac{27}{4}) \ln (256) + \ln (27) \ln (4)) \ln (3125)}{\ln (256) \ln (27) \ln (3125) \ln (4)} - \frac{\ln (256) \ln (27) \ln (4)}{\ln (256) \ln (27) \ln (3125) \ln (4)}$

Step 14

Combine the numerators over the common denominator.

$\frac{(\ln (\frac{27}{4}) \ln (256) + \ln (27) \ln (4)) \ln (3125) - \ln (256) \ln (27) \ln (4)}{\ln (256) \ln (27) \ln (3125) \ln (4)}$

Step 15

Apply the distributive property.

$\frac{\ln (\frac{27}{4}) \ln (256) \ln (3125) + \ln (27) \ln (4) \ln (3125) - \ln (256) \ln (27) \ln (4)}{\ln (256) \ln (27) \ln (3125) \ln (4)}$

Step 16

The result can be shown in multiple forms.

Exact Form:

$\frac{\ln (\frac{27}{4}) \ln (256) \ln (3125) + \ln (27) \ln (4) \ln (3125) - \ln (256) \ln (27) \ln (4)}{\ln (256) \ln (27) \ln (3125) \ln (4)}$

Decimal Form:

$0.47400433 \dots$