Precalculus Examples

$\ln (\frac{x^{2} \sqrt[4]{{(x - 1)}^{3}}}{{(x + 16)}^{3} \sqrt[5]{2 - x}})$

Step 1

Rewrite $\ln (\frac{x^{2} \sqrt[4]{{(x - 1)}^{3}}}{{(x + 16)}^{3} \sqrt[5]{2 - x}})$ as $\ln (x^{2} \sqrt[4]{{(x - 1)}^{3}}) - \ln ({(x + 16)}^{3} \sqrt[5]{2 - x})$ .

$\ln (x^{2} \sqrt[4]{{(x - 1)}^{3}}) - \ln ({(x + 16)}^{3} \sqrt[5]{2 - x})$

Step 2

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[4]{{(x - 1)}^{3}}$ as ${(x - 1)}^{\frac{3}{4}}$ .

$\ln (x^{2} {(x - 1)}^{\frac{3}{4}}) - \ln ({(x + 16)}^{3} \sqrt[5]{2 - x})$

Step 3

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[5]{2 - x}$ as ${(2 - x)}^{\frac{1}{5}}$ .

$\ln (x^{2} {(x - 1)}^{\frac{3}{4}}) - \ln ({(x + 16)}^{3} {(2 - x)}^{\frac{1}{5}})$

Step 4

Rewrite $\ln (x^{2} {(x - 1)}^{\frac{3}{4}})$ as $\ln (x^{2}) + \ln ({(x - 1)}^{\frac{3}{4}})$ .

$\ln (x^{2}) + \ln ({(x - 1)}^{\frac{3}{4}}) - \ln ({(x + 16)}^{3} {(2 - x)}^{\frac{1}{5}})$

Step 5

Expand $\ln (x^{2})$ by moving $2$ outside the logarithm.

$2 \ln (x) + \ln ({(x - 1)}^{\frac{3}{4}}) - \ln ({(x + 16)}^{3} {(2 - x)}^{\frac{1}{5}})$

Step 6

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

$2 \ln (x) + \frac{3}{4} \ln (x - 1) - \ln ({(x + 16)}^{3} {(2 - x)}^{\frac{1}{5}})$

Step 7

Rewrite $\ln ({(x + 16)}^{3} {(2 - x)}^{\frac{1}{5}})$ as $\ln ({(x + 16)}^{3}) + \ln ({(2 - x)}^{\frac{1}{5}})$ .

$2 \ln (x) + \frac{3}{4} \ln (x - 1) - (\ln ({(x + 16)}^{3}) + \ln ({(2 - x)}^{\frac{1}{5}}))$

Step 8

Expand $\ln ({(x + 16)}^{3})$ by moving $3$ outside the logarithm.

$2 \ln (x) + \frac{3}{4} \ln (x - 1) - (3 \ln (x + 16) + \ln ({(2 - x)}^{\frac{1}{5}}))$

Step 9

Expand $\ln ({(2 - x)}^{\frac{1}{5}})$ by moving $\frac{1}{5}$ outside the logarithm.

$2 \ln (x) + \frac{3}{4} \ln (x - 1) - (3 \ln (x + 16) + \frac{1}{5} \ln (2 - x))$

Step 10

Simplify each term.

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Step 10.1

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

$2 \ln (x) + \frac{3 \ln (x - 1)}{4} - (3 \ln (x + 16) + \frac{1}{5} \ln (2 - x))$

Step 10.2

Combine $\frac{1}{5}$ and $\ln (2 - x)$ .

$2 \ln (x) + \frac{3 \ln (x - 1)}{4} - (3 \ln (x + 16) + \frac{\ln (2 - x)}{5})$

Step 10.3

To write $3 \ln (x + 16)$ as a fraction with a common denominator, multiply by $\frac{5}{5}$ .

$2 \ln (x) + \frac{3 \ln (x - 1)}{4} - (3 \ln (x + 16) \cdot \frac{5}{5} + \frac{\ln (2 - x)}{5})$

Step 10.4

Combine $3 \ln (x + 16)$ and $\frac{5}{5}$ .

$2 \ln (x) + \frac{3 \ln (x - 1)}{4} - (\frac{3 \ln (x + 16) \cdot 5}{5} + \frac{\ln (2 - x)}{5})$

Step 10.5

Combine the numerators over the common denominator.

$2 \ln (x) + \frac{3 \ln (x - 1)}{4} - \frac{3 \ln (x + 16) \cdot 5 + \ln (2 - x)}{5}$

Step 10.6

Multiply $5$ by $3$ .

$2 \ln (x) + \frac{3 \ln (x - 1)}{4} - \frac{15 \ln (x + 16) + \ln (2 - x)}{5}$

Step 11

To write $2 \ln (x)$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$2 \ln (x) \cdot \frac{4}{4} + \frac{3 \ln (x - 1)}{4} - \frac{15 \ln (x + 16) + \ln (2 - x)}{5}$

Step 12

Combine $2 \ln (x)$ and $\frac{4}{4}$ .

$\frac{2 \ln (x) \cdot 4}{4} + \frac{3 \ln (x - 1)}{4} - \frac{15 \ln (x + 16) + \ln (2 - x)}{5}$

Step 13

Combine the numerators over the common denominator.

$\frac{2 \ln (x) \cdot 4 + 3 \ln (x - 1)}{4} - \frac{15 \ln (x + 16) + \ln (2 - x)}{5}$

Step 14

Multiply $4$ by $2$ .

$\frac{8 \ln (x) + 3 \ln (x - 1)}{4} - \frac{15 \ln (x + 16) + \ln (2 - x)}{5}$