Precalculus Examples

$\log (\frac{3 x^{3} \sqrt[4]{4 - x}}{4 {(x + 4)}^{2}})$

Step 1

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

$\log (3 x^{3} \sqrt[4]{4 - x}) - \log (4 {(x + 4)}^{2})$

Step 2

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

$\log (3 x^{3} {(4 - x)}^{\frac{1}{4}}) - \log (4 {(x + 4)}^{2})$

Step 3

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

$\log (3 x^{3}) + \log ({(4 - x)}^{\frac{1}{4}}) - \log (4 {(x + 4)}^{2})$

Step 4

Rewrite $\log (3 x^{3})$ as $\log (3) + \log (x^{3})$ .

$\log (3) + \log (x^{3}) + \log ({(4 - x)}^{\frac{1}{4}}) - \log (4 {(x + 4)}^{2})$

Step 5

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

$\log (3) + 3 \log (x) + \log ({(4 - x)}^{\frac{1}{4}}) - \log (4 {(x + 4)}^{2})$

Step 6

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

$\log (3) + 3 \log (x) + \frac{1}{4} \log (4 - x) - \log (4 {(x + 4)}^{2})$

Step 7

Rewrite $\log (4 {(x + 4)}^{2})$ as $\log (4) + \log ({(x + 4)}^{2})$ .

$\log (3) + 3 \log (x) + \frac{1}{4} \log (4 - x) - (\log (4) + \log ({(x + 4)}^{2}))$

Step 8

Expand $\log ({(x + 4)}^{2})$ by moving $2$ outside the logarithm.

$\log (3) + 3 \log (x) + \frac{1}{4} \log (4 - x) - (\log (4) + 2 \log (x + 4))$

Step 9

Simplify each term.

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Step 9.1

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

$\log (3) + 3 \log (x) + \frac{\log (4 - x)}{4} - (\log (4) + 2 \log (x + 4))$

Step 9.2

Simplify each term.

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Step 9.2.1

Rewrite $\log (4)$ as $\log (2^{2})$ .

$\log (3) + 3 \log (x) + \frac{\log (4 - x)}{4} - (\log (2^{2}) + 2 \log (x + 4))$

Step 9.2.2

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

$\log (3) + 3 \log (x) + \frac{\log (4 - x)}{4} - (2 \log (2) + 2 \log (x + 4))$

Step 9.3

Apply the distributive property.

$\log (3) + 3 \log (x) + \frac{\log (4 - x)}{4} - (2 \log (2)) - (2 \log (x + 4))$

Step 9.4

Multiply $2$ by $- 1$ .

$\log (3) + 3 \log (x) + \frac{\log (4 - x)}{4} - 2 \log (2) - (2 \log (x + 4))$

Step 9.5

Multiply $2$ by $- 1$ .

$\log (3) + 3 \log (x) + \frac{\log (4 - x)}{4} - 2 \log (2) - 2 \log (x + 4)$

Step 10

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

$3 \log (x) + \log (3) \cdot \frac{4}{4} + \frac{\log (4 - x)}{4} - 2 \log (2) - 2 \log (x + 4)$

Step 11

Combine $\log (3)$ and $\frac{4}{4}$ .

$3 \log (x) + \frac{\log (3) \cdot 4}{4} + \frac{\log (4 - x)}{4} - 2 \log (2) - 2 \log (x + 4)$

Step 12

Combine the numerators over the common denominator.

$3 \log (x) + \frac{\log (3) \cdot 4 + \log (4 - x)}{4} - 2 \log (2) - 2 \log (x + 4)$

Step 13

Move $4$ to the left of $\log (3)$ .

$3 \log (x) + \frac{4 \log (3) + \log (4 - x)}{4} - 2 \log (2) - 2 \log (x + 4)$

Step 14

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

$3 \log (x) + \frac{4 \log (3) + \log (4 - x)}{4} - 2 \log (x + 4) \cdot \frac{4}{4} - 2 \log (2)$

Step 15

Combine $- 2 \log (x + 4)$ and $\frac{4}{4}$ .

$3 \log (x) + \frac{4 \log (3) + \log (4 - x)}{4} + \frac{- 2 \log (x + 4) \cdot 4}{4} - 2 \log (2)$

Step 16

Combine the numerators over the common denominator.

$3 \log (x) + \frac{4 \log (3) + \log (4 - x) - 2 \log (x + 4) \cdot 4}{4} - 2 \log (2)$

Step 17

Multiply $4$ by $- 2$ .

$3 \log (x) + \frac{4 \log (3) + \log (4 - x) - 8 \log (x + 4)}{4} - 2 \log (2)$