Precalculus Examples

$(\frac{1}{3}) \log_{4} (2 a) + (\frac{1}{3}) \log_{4} (5 b) - 2 \log_{4} (a) - \log_{4} (b)$

Step 1

Simplify each term.

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Step 1.1

Simplify $(\frac{1}{3}) \log_{4} (2 a)$ by moving $\frac{1}{3}$ inside the logarithm.

$\log_{4} ({(2 a)}^{\frac{1}{3}}) + (\frac{1}{3}) \log_{4} (5 b) - 2 \log_{4} (a) - \log_{4} (b)$

Step 1.2

Apply the product rule to $2 a$ .

$\log_{4} (2^{\frac{1}{3}} a^{\frac{1}{3}}) + (\frac{1}{3}) \log_{4} (5 b) - 2 \log_{4} (a) - \log_{4} (b)$

Step 1.3

Simplify $(\frac{1}{3}) \log_{4} (5 b)$ by moving $\frac{1}{3}$ inside the logarithm.

$\log_{4} (2^{\frac{1}{3}} a^{\frac{1}{3}}) + \log_{4} ({(5 b)}^{\frac{1}{3}}) - 2 \log_{4} (a) - \log_{4} (b)$

Step 1.4

Apply the product rule to $5 b$ .

$\log_{4} (2^{\frac{1}{3}} a^{\frac{1}{3}}) + \log_{4} (5^{\frac{1}{3}} b^{\frac{1}{3}}) - 2 \log_{4} (a) - \log_{4} (b)$

Step 1.5

Simplify $- 2 \log_{4} (a)$ by moving $2$ inside the logarithm.

$\log_{4} (2^{\frac{1}{3}} a^{\frac{1}{3}}) + \log_{4} (5^{\frac{1}{3}} b^{\frac{1}{3}}) - \log_{4} (a^{2}) - \log_{4} (b)$

Step 2

Use the product property of logarithms, $\log_{b} (x) + \log_{b} (y) = \log_{b} (x y)$ .

$\log_{4} (2^{\frac{1}{3}} a^{\frac{1}{3}} (5^{\frac{1}{3}} b^{\frac{1}{3}})) - \log_{4} (a^{2}) - \log_{4} (b)$

Step 3

Use the quotient property of logarithms, $\log_{b} (x) - \log_{b} (y) = \log_{b} (\frac{x}{y})$ .

$\log_{4} (\frac{2^{\frac{1}{3}} a^{\frac{1}{3}} (5^{\frac{1}{3}} b^{\frac{1}{3}})}{a^{2}}) - \log_{4} (b)$

Step 4

Use the quotient property of logarithms, $\log_{b} (x) - \log_{b} (y) = \log_{b} (\frac{x}{y})$ .

$\log_{4} (\frac{\frac{2^{\frac{1}{3}} a^{\frac{1}{3}} (5^{\frac{1}{3}} b^{\frac{1}{3}})}{a^{2}}}{b})$

Step 5

Factor $a^{2}$ out of $2^{\frac{1}{3}} a^{\frac{1}{3}} (5^{\frac{1}{3}} b^{\frac{1}{3}})$ .

$\log_{4} (\frac{\frac{a^{2} (2^{\frac{1}{3}} a^{\frac{- 5}{3}} (5^{\frac{1}{3}} b^{\frac{1}{3}}))}{a^{2}}}{b})$

Step 6

Cancel the common factors.

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Step 6.1

Multiply by $1$ .

$\log_{4} (\frac{\frac{a^{2} (2^{\frac{1}{3}} a^{\frac{- 5}{3}} (5^{\frac{1}{3}} b^{\frac{1}{3}}))}{a^{2} \cdot 1}}{b})$

Step 6.2

Cancel the common factor.

$\log_{4} (\frac{\frac{a^{2} (2^{\frac{1}{3}} a^{\frac{- 5}{3}} (5^{\frac{1}{3}} b^{\frac{1}{3}}))}{a^{2} \cdot 1}}{b})$

Step 6.3

Rewrite the expression.

$\log_{4} (\frac{\frac{2^{\frac{1}{3}} a^{\frac{- 5}{3}} (5^{\frac{1}{3}} b^{\frac{1}{3}})}{1}}{b})$

Step 6.4

Divide $2^{\frac{1}{3}} a^{\frac{- 5}{3}} (5^{\frac{1}{3}} b^{\frac{1}{3}})$ by $1$ .

$\log_{4} (\frac{2^{\frac{1}{3}} a^{\frac{- 5}{3}} (5^{\frac{1}{3}} b^{\frac{1}{3}})}{b})$

Step 7

Factor $b$ out of $2^{\frac{1}{3}} a^{\frac{- 5}{3}} (5^{\frac{1}{3}} b^{\frac{1}{3}})$ .

$\log_{4} (\frac{b (2^{\frac{1}{3}} a^{\frac{- 5}{3}} (5^{\frac{1}{3}} b^{\frac{- 2}{3}}))}{b})$

Step 8

Cancel the common factors.

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Step 8.1

Raise $b$ to the power of $1$ .

$\log_{4} (\frac{b (2^{\frac{1}{3}} a^{\frac{- 5}{3}} (5^{\frac{1}{3}} b^{\frac{- 2}{3}}))}{b^{1}})$

Step 8.2

Factor $b$ out of $b^{1}$ .

$\log_{4} (\frac{b (2^{\frac{1}{3}} a^{\frac{- 5}{3}} (5^{\frac{1}{3}} b^{\frac{- 2}{3}}))}{b \cdot 1})$

Step 8.3

Cancel the common factor.

$\log_{4} (\frac{b (2^{\frac{1}{3}} a^{\frac{- 5}{3}} (5^{\frac{1}{3}} b^{\frac{- 2}{3}}))}{b \cdot 1})$

Step 8.4

Rewrite the expression.

$\log_{4} (\frac{2^{\frac{1}{3}} a^{\frac{- 5}{3}} (5^{\frac{1}{3}} b^{\frac{- 2}{3}})}{1})$

Step 8.5

Divide $2^{\frac{1}{3}} a^{\frac{- 5}{3}} (5^{\frac{1}{3}} b^{\frac{- 2}{3}})$ by $1$ .

$\log_{4} (2^{\frac{1}{3}} a^{\frac{- 5}{3}} (5^{\frac{1}{3}} b^{\frac{- 2}{3}}))$

Step 9

Rewrite using the commutative property of multiplication.

$\log_{4} (2^{\frac{1}{3}} \cdot 5^{\frac{1}{3}} a^{\frac{- 5}{3}} b^{\frac{- 2}{3}})$

Step 10

Move the negative in front of the fraction.

$\log_{4} (2^{\frac{1}{3}} \cdot 5^{\frac{1}{3}} a^{- \frac{5}{3}} b^{\frac{- 2}{3}})$

Step 11

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\log_{4} (2^{\frac{1}{3}} \cdot 5^{\frac{1}{3}} \frac{1}{a^{\frac{5}{3}}} b^{\frac{- 2}{3}})$

Step 12

Multiply $2^{\frac{1}{3}} \cdot 5^{\frac{1}{3}} \frac{1}{a^{\frac{5}{3}}}$ .

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Step 12.1

Combine $2^{\frac{1}{3}}$ and $\frac{1}{a^{\frac{5}{3}}}$ .

$\log_{4} (5^{\frac{1}{3}} \frac{2^{\frac{1}{3}}}{a^{\frac{5}{3}}} b^{\frac{- 2}{3}})$

Step 12.2

Combine $5^{\frac{1}{3}}$ and $\frac{2^{\frac{1}{3}}}{a^{\frac{5}{3}}}$ .

$\log_{4} (\frac{5^{\frac{1}{3}} \cdot 2^{\frac{1}{3}}}{a^{\frac{5}{3}}} b^{\frac{- 2}{3}})$

Step 13

Move the negative in front of the fraction.

$\log_{4} (\frac{5^{\frac{1}{3}} \cdot 2^{\frac{1}{3}}}{a^{\frac{5}{3}}} b^{- \frac{2}{3}})$

Step 14

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\log_{4} (\frac{5^{\frac{1}{3}} \cdot 2^{\frac{1}{3}}}{a^{\frac{5}{3}}} \cdot \frac{1}{b^{\frac{2}{3}}})$

Step 15

Combine.

$\log_{4} (\frac{5^{\frac{1}{3}} \cdot 2^{\frac{1}{3}} \cdot 1}{a^{\frac{5}{3}} b^{\frac{2}{3}}})$

Step 16

Multiply $5^{\frac{1}{3}}$ by $1$ .

$\log_{4} (\frac{5^{\frac{1}{3}} \cdot 2^{\frac{1}{3}}}{a^{\frac{5}{3}} b^{\frac{2}{3}}})$