Basic Math Examples

$\log_{7} (\frac{1}{\sqrt{7}})$

Step 1

Multiply $\frac{1}{\sqrt{7}}$ by $\frac{\sqrt{7}}{\sqrt{7}}$ .

$\log_{7} (\frac{1}{\sqrt{7}} \cdot \frac{\sqrt{7}}{\sqrt{7}})$

Step 2

Combine and simplify the denominator.

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Step 2.1

Multiply $\frac{1}{\sqrt{7}}$ by $\frac{\sqrt{7}}{\sqrt{7}}$ .

$\log_{7} (\frac{\sqrt{7}}{\sqrt{7} \sqrt{7}})$

Step 2.2

Raise $\sqrt{7}$ to the power of $1$ .

$\log_{7} (\frac{\sqrt{7}}{{\sqrt{7}}^{1} \sqrt{7}})$

Step 2.3

Raise $\sqrt{7}$ to the power of $1$ .

$\log_{7} (\frac{\sqrt{7}}{{\sqrt{7}}^{1} {\sqrt{7}}^{1}})$

Step 2.4

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

$\log_{7} (\frac{\sqrt{7}}{{\sqrt{7}}^{1 + 1}})$

Step 2.5

Add $1$ and $1$ .

$\log_{7} (\frac{\sqrt{7}}{{\sqrt{7}}^{2}})$

Step 2.6

Rewrite ${\sqrt{7}}^{2}$ as $7$ .

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Step 2.6.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{7}$ as $7^{\frac{1}{2}}$ .

$\log_{7} (\frac{\sqrt{7}}{{(7^{\frac{1}{2}})}^{2}})$

Step 2.6.2

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

$\log_{7} (\frac{\sqrt{7}}{7^{\frac{1}{2} \cdot 2}})$

Step 2.6.3

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

$\log_{7} (\frac{\sqrt{7}}{7^{\frac{2}{2}}})$

Step 2.6.4

Cancel the common factor of $2$ .

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Step 2.6.4.1

Cancel the common factor.

$\log_{7} (\frac{\sqrt{7}}{7^{\frac{2}{2}}})$

Step 2.6.4.2

Rewrite the expression.

$\log_{7} (\frac{\sqrt{7}}{7^{1}})$

Step 2.6.5

Evaluate the exponent.

$\log_{7} (\frac{\sqrt{7}}{7})$

Step 3

Rewrite $\frac{\sqrt{7}}{7}$ as $\sqrt{7} \cdot 7^{- 1}$ .

$\log_{7} (\sqrt{7} \cdot 7^{- 1})$

Step 4

Rewrite $\log_{7} (\sqrt{7} \cdot 7^{- 1})$ as $\log_{7} (\sqrt{7}) + \log_{7} (7^{- 1})$ .

$\log_{7} (\sqrt{7}) + \log_{7} (7^{- 1})$

Step 5

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

$\log_{7} (\sqrt{7}) - \log_{7} (7)$

Step 6

Logarithm base $7$ of $7$ is $1$ .

$\log_{7} (\sqrt{7}) - 1 \cdot 1$

Step 7

Multiply $- 1$ by $1$ .

$\log_{7} (\sqrt{7}) - 1$

Step 8

Rewrite $\log_{7} (\sqrt{7})$ using the change of base formula.

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Step 8.1

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 8.2

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

$\frac{\log (\sqrt{7})}{\log (7)} - 1$

Step 9

The result can be shown in multiple forms.

Exact Form:

$\frac{\log (\sqrt{7})}{\log (7)} - 1$

Decimal Form:

$- 0.5$