Trigonometry Examples

$\log_{9} (\sqrt{9})$

Step 1

Rewrite $9$ as $3^{2}$ .

$\log_{9} (\sqrt{3^{2}})$

Step 2

Pull terms out from under the radical, assuming positive real numbers.

$\log_{9} (3)$

Step 3

Logarithm base $9$ of $3$ is $\frac{1}{2}$ .

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Step 3.1

Rewrite as an equation.

$\log_{9} (3) = x$

Step 3.2

Rewrite $\log_{9} (3) = x$ in exponential form using the definition of a logarithm. If $x$ and $b$ are positive real numbers and $b$ does not equal $1$ , then $\log_{b} (x) = y$ is equivalent to $b^{y} = x$ .

$9^{x} = 3$

Step 3.3

Create expressions in the equation that all have equal bases.

${(3^{2})}^{x} = 3^{1}$

Step 3.4

Rewrite ${(3^{2})}^{x}$ as $3^{2 x}$ .

$3^{2 x} = 3^{1}$

Step 3.5

Since the bases are the same, then two expressions are only equal if the exponents are also equal.

$2 x = 1$

Step 3.6

Solve for $x$ .

$x = \frac{1}{2}$

Step 3.7

The variable $x$ is equal to $\frac{1}{2}$ .

$\frac{1}{2}$

Step 4

The result can be shown in multiple forms.

Exact Form:

$\frac{1}{2}$

Decimal Form:

$0.5$