Precalculus Examples

$\log_{b} (\frac{x^{7} y^{- 3} \sqrt[5]{z^{4}}}{w^{3} \sqrt{b}})$

Step 1

Rewrite $\log_{b} (\frac{x^{7} y^{- 3} \sqrt[5]{z^{4}}}{w^{3} \sqrt{b}})$ as $\log_{b} (x^{7} y^{- 3} \sqrt[5]{z^{4}}) - \log_{b} (w^{3} \sqrt{b})$ .

$\log_{b} (x^{7} y^{- 3} \sqrt[5]{z^{4}}) - \log_{b} (w^{3} \sqrt{b})$

Step 2

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[5]{z^{4}}$ as $z^{\frac{4}{5}}$ .

$\log_{b} (x^{7} y^{- 3} z^{\frac{4}{5}}) - \log_{b} (w^{3} \sqrt{b})$

Step 3

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

$\log_{b} (x^{7} y^{- 3} z^{\frac{4}{5}}) - \log_{b} (w^{3} b^{\frac{1}{2}})$

Step 4

Rewrite $\log_{b} (x^{7} y^{- 3} z^{\frac{4}{5}})$ as $\log_{b} (x^{7} y^{- 3}) + \log_{b} (z^{\frac{4}{5}})$ .

$\log_{b} (x^{7} y^{- 3}) + \log_{b} (z^{\frac{4}{5}}) - \log_{b} (w^{3} b^{\frac{1}{2}})$

Step 5

Rewrite $\log_{b} (x^{7} y^{- 3})$ as $\log_{b} (x^{7}) + \log_{b} (y^{- 3})$ .

$\log_{b} (x^{7}) + \log_{b} (y^{- 3}) + \log_{b} (z^{\frac{4}{5}}) - \log_{b} (w^{3} b^{\frac{1}{2}})$

Step 6

Expand $\log_{b} (x^{7})$ by moving $7$ outside the logarithm.

$7 \log_{b} (x) + \log_{b} (y^{- 3}) + \log_{b} (z^{\frac{4}{5}}) - \log_{b} (w^{3} b^{\frac{1}{2}})$

Step 7

Expand $\log_{b} (y^{- 3})$ by moving $- 3$ outside the logarithm.

$7 \log_{b} (x) - 3 \log_{b} (y) + \log_{b} (z^{\frac{4}{5}}) - \log_{b} (w^{3} b^{\frac{1}{2}})$

Step 8

Expand $\log_{b} (z^{\frac{4}{5}})$ by moving $\frac{4}{5}$ outside the logarithm.

$7 \log_{b} (x) - 3 \log_{b} (y) + \frac{4}{5} \log_{b} (z) - \log_{b} (w^{3} b^{\frac{1}{2}})$

Step 9

Rewrite $\log_{b} (w^{3} b^{\frac{1}{2}})$ as $\log_{b} (w^{3}) + \log_{b} (b^{\frac{1}{2}})$ .

$7 \log_{b} (x) - 3 \log_{b} (y) + \frac{4}{5} \log_{b} (z) - (\log_{b} (w^{3}) + \log_{b} (b^{\frac{1}{2}}))$

Step 10

Expand $\log_{b} (w^{3})$ by moving $3$ outside the logarithm.

$7 \log_{b} (x) - 3 \log_{b} (y) + \frac{4}{5} \log_{b} (z) - (3 \log_{b} (w) + \log_{b} (b^{\frac{1}{2}}))$

Step 11

Expand $\log_{b} (b^{\frac{1}{2}})$ by moving $\frac{1}{2}$ outside the logarithm.

$7 \log_{b} (x) - 3 \log_{b} (y) + \frac{4}{5} \log_{b} (z) - (3 \log_{b} (w) + \frac{1}{2} \log_{b} (b))$

Step 12

Logarithm base $b$ of $b$ is $1$ .

$7 \log_{b} (x) - 3 \log_{b} (y) + \frac{4}{5} \log_{b} (z) - (3 \log_{b} (w) + \frac{1}{2} \cdot 1)$

Step 13

Multiply $\frac{1}{2}$ by $1$ .

$7 \log_{b} (x) - 3 \log_{b} (y) + \frac{4}{5} \log_{b} (z) - (3 \log_{b} (w) + \frac{1}{2})$

Step 14

Simplify each term.

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Step 14.1

Combine $\frac{4}{5}$ and $\log_{b} (z)$ .

$7 \log_{b} (x) - 3 \log_{b} (y) + \frac{4 \log_{b} (z)}{5} - (3 \log_{b} (w) + \frac{1}{2})$

Step 14.2

Apply the distributive property.

$7 \log_{b} (x) - 3 \log_{b} (y) + \frac{4 \log_{b} (z)}{5} - (3 \log_{b} (w)) - \frac{1}{2}$

Step 14.3

Multiply $3$ by $- 1$ .

$7 \log_{b} (x) - 3 \log_{b} (y) + \frac{4 \log_{b} (z)}{5} - 3 \log_{b} (w) - \frac{1}{2}$