Evaluate log base 5 of 1/( square root of 5)

$\log_{5} (\frac{1}{\sqrt{5}})$

Step 1

Multiply $\frac{1}{\sqrt{5}}$ by $\frac{\sqrt{5}}{\sqrt{5}}$ .

$\log_{5} (\frac{1}{\sqrt{5}} \cdot \frac{\sqrt{5}}{\sqrt{5}})$

Step 2

Combine and simplify the denominator.

Multiply $\frac{1}{\sqrt{5}}$ by $\frac{\sqrt{5}}{\sqrt{5}}$ .

$\log_{5} (\frac{\sqrt{5}}{\sqrt{5} \sqrt{5}})$

Raise $\sqrt{5}$ to the power of $1$ .

$\log_{5} (\frac{\sqrt{5}}{{\sqrt{5}}^{1} \sqrt{5}})$

Raise $\sqrt{5}$ to the power of $1$ .

$\log_{5} (\frac{\sqrt{5}}{{\sqrt{5}}^{1} {\sqrt{5}}^{1}})$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\log_{5} (\frac{\sqrt{5}}{{\sqrt{5}}^{1 + 1}})$

Add $1$ and $1$ .

$\log_{5} (\frac{\sqrt{5}}{{\sqrt{5}}^{2}})$

Rewrite ${\sqrt{5}}^{2}$ as $5$ .

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{5}$ as $5^{\frac{1}{2}}$ .

$\log_{5} (\frac{\sqrt{5}}{{(5^{\frac{1}{2}})}^{2}})$

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\log_{5} (\frac{\sqrt{5}}{5^{\frac{1}{2} \cdot 2}})$

Combine $\frac{1}{2}$ and $2$ .

$\log_{5} (\frac{\sqrt{5}}{5^{\frac{2}{2}}})$

Cancel the common factor of $2$ .

Cancel the common factor.

$\log_{5} (\frac{\sqrt{5}}{5^{\frac{2}{2}}})$

Rewrite the expression.

$\log_{5} (\frac{\sqrt{5}}{5^{1}})$

Evaluate the exponent.

$\log_{5} (\frac{\sqrt{5}}{5})$

Step 3

Rewrite $\frac{\sqrt{5}}{5}$ as $\sqrt{5} \cdot 5^{- 1}$ .

$\log_{5} (\sqrt{5} \cdot 5^{- 1})$

Step 4

Rewrite $\log_{5} (\sqrt{5} \cdot 5^{- 1})$ as $\log_{5} (\sqrt{5}) + \log_{5} (5^{- 1})$ .

$\log_{5} (\sqrt{5}) + \log_{5} (5^{- 1})$

Step 5

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

$\log_{5} (\sqrt{5}) - \log_{5} (5)$

Step 6

Logarithm base $5$ of $5$ is $1$ .

$\log_{5} (\sqrt{5}) - 1 \cdot 1$

Step 7

Multiply $- 1$ by $1$ .

$\log_{5} (\sqrt{5}) - 1$

Step 8

Rewrite $\log_{5} (\sqrt{5})$ using the change of base formula.

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 $0$ .

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

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

$\frac{\log (\sqrt{5})}{\log (5)} - 1$

Step 9

The result can be shown in multiple forms.

Exact Form:

$\frac{\log (\sqrt{5})}{\log (5)} - 1$

Decimal Form:

$- 0.5$

Evaluate log base 5 of 1/( square root of 5)

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