Algebra Examples

$\log_{4} (\frac{17}{4})$

Step 1

Rewrite $\frac{17}{4}$ as $17 \cdot 4^{- 1}$ .

$\log_{4} (17 \cdot 4^{- 1})$

Step 2

Rewrite $\log_{4} (17 \cdot 4^{- 1})$ as $\log_{4} (17) + \log_{4} (4^{- 1})$ .

$\log_{4} (17) + \log_{4} (4^{- 1})$

Step 3

Use logarithm rules to move $- 1$ out of the exponent.

$\log_{4} (17) - \log_{4} (4)$

Step 4

Logarithm base $4$ of $4$ is $1$ .

$\log_{4} (17) - 1 \cdot 1$

Step 5

Multiply $- 1$ by $1$ .

$\log_{4} (17) - 1$

Step 6

Rewrite $\log_{4} (17)$ using the change of base formula.

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Step 6.1

The change of base rule can be used if $a$ and $b$ are greater than $0$ and not equal to $1$ , and $x$ is greater than $0$ .

$\log_{a} (x) = \frac{\log_{b} (x)}{\log_{b} (a)} - 1$

Step 6.2

Substitute in values for the variables in the change of base formula, using $b = 10$ .

$\frac{\log (17)}{\log (4)} - 1$

Step 7

The result can be shown in multiple forms.

Exact Form:

$\frac{\log (17)}{\log (4)} - 1$

Decimal Form:

$1.04373142 \dots$