Precalculus Examples

$\log_{5} (\frac{x^{2} - 6 x + 8}{\sqrt[4]{x + 1} {(6 x - 19)}^{3}})$

Step 1

Rewrite $\log_{5} (\frac{x^{2} - 6 x + 8}{\sqrt[4]{x + 1} {(6 x - 19)}^{3}})$ as $\log_{5} (x^{2} - 6 x + 8) - \log_{5} (\sqrt[4]{x + 1} {(6 x - 19)}^{3})$ .

$\log_{5} (x^{2} - 6 x + 8) - \log_{5} (\sqrt[4]{x + 1} {(6 x - 19)}^{3})$

Step 2

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

$\log_{5} (x^{2} - 6 x + 8) - \log_{5} ({(x + 1)}^{\frac{1}{4}} {(6 x - 19)}^{3})$

Step 3

Rewrite $\log_{5} ({(x + 1)}^{\frac{1}{4}} {(6 x - 19)}^{3})$ as $\log_{5} ({(x + 1)}^{\frac{1}{4}}) + \log_{5} ({(6 x - 19)}^{3})$ .

$\log_{5} (x^{2} - 6 x + 8) - (\log_{5} ({(x + 1)}^{\frac{1}{4}}) + \log_{5} ({(6 x - 19)}^{3}))$

Step 4

Expand $\log_{5} ({(x + 1)}^{\frac{1}{4}})$ by moving $\frac{1}{4}$ outside the logarithm.

$\log_{5} (x^{2} - 6 x + 8) - (\frac{1}{4} \log_{5} (x + 1) + \log_{5} ({(6 x - 19)}^{3}))$

Step 5

Expand $\log_{5} ({(6 x - 19)}^{3})$ by moving $3$ outside the logarithm.

$\log_{5} (x^{2} - 6 x + 8) - (\frac{1}{4} \log_{5} (x + 1) + 3 \log_{5} (6 x - 19))$

Step 6

Simplify each term.

Tap for more steps...

Step 6.1

Combine $\frac{1}{4}$ and $\log_{5} (x + 1)$ .

$\log_{5} (x^{2} - 6 x + 8) - (\frac{\log_{5} (x + 1)}{4} + 3 \log_{5} (6 x - 19))$

Step 6.2

To write $3 \log_{5} (6 x - 19)$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$\log_{5} (x^{2} - 6 x + 8) - (\frac{\log_{5} (x + 1)}{4} + 3 \log_{5} (6 x - 19) \cdot \frac{4}{4})$

Step 6.3

Combine $3 \log_{5} (6 x - 19)$ and $\frac{4}{4}$ .

$\log_{5} (x^{2} - 6 x + 8) - (\frac{\log_{5} (x + 1)}{4} + \frac{3 \log_{5} (6 x - 19) \cdot 4}{4})$

Step 6.4

Combine the numerators over the common denominator.

$\log_{5} (x^{2} - 6 x + 8) - \frac{\log_{5} (x + 1) + 3 \log_{5} (6 x - 19) \cdot 4}{4}$

Step 6.5

Multiply $4$ by $3$ .

$\log_{5} (x^{2} - 6 x + 8) - \frac{\log_{5} (x + 1) + 12 \log_{5} (6 x - 19)}{4}$

Step 7

To write $\log_{5} (x^{2} - 6 x + 8)$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$\log_{5} (x^{2} - 6 x + 8) \cdot \frac{4}{4} - \frac{\log_{5} (x + 1) + 12 \log_{5} (6 x - 19)}{4}$

Step 8

Combine $\log_{5} (x^{2} - 6 x + 8)$ and $\frac{4}{4}$ .

$\frac{\log_{5} (x^{2} - 6 x + 8) \cdot 4}{4} - \frac{\log_{5} (x + 1) + 12 \log_{5} (6 x - 19)}{4}$

Step 9

Combine the numerators over the common denominator.

$\frac{\log_{5} (x^{2} - 6 x + 8) \cdot 4 - (\log_{5} (x + 1) + 12 \log_{5} (6 x - 19))}{4}$

Step 10

Simplify the numerator.

Tap for more steps...

Step 10.1

Move $4$ to the left of $\log_{5} (x^{2} - 6 x + 8)$ .

$\frac{4 \cdot \log_{5} (x^{2} - 6 x + 8) - (\log_{5} (x + 1) + 12 \log_{5} (6 x - 19))}{4}$

Step 10.2

Apply the distributive property.

$\frac{4 \log_{5} (x^{2} - 6 x + 8) - \log_{5} (x + 1) - (12 \log_{5} (6 x - 19))}{4}$

Step 10.3

Multiply $12$ by $- 1$ .

$\frac{4 \log_{5} (x^{2} - 6 x + 8) - \log_{5} (x + 1) - 12 \log_{5} (6 x - 19)}{4}$