Precalculus Examples

$\ln (\frac{3 e^{5 x - 7} {(3 x + 1)}^{4}}{(x - 2) \sqrt[3]{x}})$

Step 1

Rewrite $\ln (\frac{3 e^{5 x - 7} {(3 x + 1)}^{4}}{(x - 2) \sqrt[3]{x}})$ as $\ln (3 e^{5 x - 7} {(3 x + 1)}^{4}) - \ln ((x - 2) \sqrt[3]{x})$ .

$\ln (3 e^{5 x - 7} {(3 x + 1)}^{4}) - \ln ((x - 2) \sqrt[3]{x})$

Step 2

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[3]{x}$ as $x^{\frac{1}{3}}$ .

$\ln (3 e^{5 x - 7} {(3 x + 1)}^{4}) - \ln ((x - 2) x^{\frac{1}{3}})$

Step 3

Rewrite $\ln (3 e^{5 x - 7} {(3 x + 1)}^{4})$ as $\ln (3 e^{5 x - 7}) + \ln ({(3 x + 1)}^{4})$ .

$\ln (3 e^{5 x - 7}) + \ln ({(3 x + 1)}^{4}) - \ln ((x - 2) x^{\frac{1}{3}})$

Step 4

Rewrite $\ln (3 e^{5 x - 7})$ as $\ln (3) + \ln (e^{5 x - 7})$ .

$\ln (3) + \ln (e^{5 x - 7}) + \ln ({(3 x + 1)}^{4}) - \ln ((x - 2) x^{\frac{1}{3}})$

Step 5

Expand $\ln (e^{5 x - 7})$ by moving $5 x - 7$ outside the logarithm.

$\ln (3) + (5 x - 7) \ln (e) + \ln ({(3 x + 1)}^{4}) - \ln ((x - 2) x^{\frac{1}{3}})$

Step 6

Expand $\ln ({(3 x + 1)}^{4})$ by moving $4$ outside the logarithm.

$\ln (3) + (5 x - 7) \ln (e) + 4 \ln (3 x + 1) - \ln ((x - 2) x^{\frac{1}{3}})$

Step 7

The natural logarithm of $e$ is $1$ .

$\ln (3) + (5 x - 7) \cdot 1 + 4 \ln (3 x + 1) - \ln ((x - 2) x^{\frac{1}{3}})$

Step 8

Multiply $5 x - 7$ by $1$ .

$\ln (3) + 5 x - 7 + 4 \ln (3 x + 1) - \ln ((x - 2) x^{\frac{1}{3}})$

Step 9

Rewrite $\ln ((x - 2) x^{\frac{1}{3}})$ as $\ln (x - 2) + \ln (x^{\frac{1}{3}})$ .

$\ln (3) + 5 x - 7 + 4 \ln (3 x + 1) - (\ln (x - 2) + \ln (x^{\frac{1}{3}}))$

Step 10

Expand $\ln (x^{\frac{1}{3}})$ by moving $\frac{1}{3}$ outside the logarithm.

$\ln (3) + 5 x - 7 + 4 \ln (3 x + 1) - (\ln (x - 2) + \frac{1}{3} \ln (x))$

Step 11

Simplify each term.

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Step 11.1

Combine $\frac{1}{3}$ and $\ln (x)$ .

$\ln (3) + 5 x - 7 + 4 \ln (3 x + 1) - (\ln (x - 2) + \frac{\ln (x)}{3})$

Step 11.2

To write $\ln (x - 2)$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$\ln (3) + 5 x - 7 + 4 \ln (3 x + 1) - (\ln (x - 2) \cdot \frac{3}{3} + \frac{\ln (x)}{3})$

Step 11.3

Combine $\ln (x - 2)$ and $\frac{3}{3}$ .

$\ln (3) + 5 x - 7 + 4 \ln (3 x + 1) - (\frac{\ln (x - 2) \cdot 3}{3} + \frac{\ln (x)}{3})$

Step 11.4

Combine the numerators over the common denominator.

$\ln (3) + 5 x - 7 + 4 \ln (3 x + 1) - \frac{\ln (x - 2) \cdot 3 + \ln (x)}{3}$

Step 11.5

Move $3$ to the left of $\ln (x - 2)$ .

$\ln (3) + 5 x - 7 + 4 \ln (3 x + 1) - \frac{3 \ln (x - 2) + \ln (x)}{3}$

Step 12

To write $4 \ln (3 x + 1)$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$\ln (3) + 5 x - 7 + 4 \ln (3 x + 1) \cdot \frac{3}{3} - \frac{3 \ln (x - 2) + \ln (x)}{3}$

Step 13

Combine $4 \ln (3 x + 1)$ and $\frac{3}{3}$ .

$\ln (3) + 5 x - 7 + \frac{4 \ln (3 x + 1) \cdot 3}{3} - \frac{3 \ln (x - 2) + \ln (x)}{3}$

Step 14

Combine the numerators over the common denominator.

$\ln (3) + 5 x - 7 + \frac{4 \ln (3 x + 1) \cdot 3 - (3 \ln (x - 2) + \ln (x))}{3}$

Step 15

Simplify the numerator.

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Step 15.1

Multiply $3$ by $4$ .

$\ln (3) + 5 x - 7 + \frac{12 \ln (3 x + 1) - (3 \ln (x - 2) + \ln (x))}{3}$

Step 15.2

Apply the distributive property.

$\ln (3) + 5 x - 7 + \frac{12 \ln (3 x + 1) - (3 \ln (x - 2)) - \ln (x)}{3}$

Step 15.3

Multiply $3$ by $- 1$ .

$\ln (3) + 5 x - 7 + \frac{12 \ln (3 x + 1) - 3 \ln (x - 2) - \ln (x)}{3}$