Algebra Examples

$\log_{2} (x) = - 1$

Step 1

Rewrite $\log_{2} (x) = - 1$ in exponential form using the definition of a logarithm. If $x$ and $b$ are positive real numbers and $b \neq 1$ , then $\log_{b} (x) = y$ is equivalent to $b^{y} = x$ .

$2^{- 1} = x$

Step 2

Solve for $x$ .

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Step 2.1

Rewrite the equation as $x = 2^{- 1}$ .

$x = 2^{- 1}$

Step 2.2

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

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

Step 3

The result can be shown in multiple forms.

Exact Form:

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

Decimal Form:

$x = 0.5$