Algebra Examples

$\log_{49} (x) = \frac{1}{2}$

Step 1

Rewrite $\log_{49} (x) = \frac{1}{2}$ 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 $b^{y} = x$ .

$49^{\frac{1}{2}} = x$

Step 2

Solve for $x$ .

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Step 2.1

Rewrite the equation as $x = 49^{\frac{1}{2}}$ .

$x = 49^{\frac{1}{2}}$

Step 2.2

Simplify $49^{\frac{1}{2}}$ .

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Step 2.2.1

Simplify the expression.

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Step 2.2.1.1

Rewrite $49$ as $7^{2}$ .

$x = {(7^{2})}^{\frac{1}{2}}$

Step 2.2.1.2

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

$x = 7^{2 (\frac{1}{2})}$

Step 2.2.2

Cancel the common factor of $2$ .

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Step 2.2.2.1

Cancel the common factor.

$x = 7^{2 (\frac{1}{2})}$

Step 2.2.2.2

Rewrite the expression.

$x = 7^{1}$

Step 2.2.3

Evaluate the exponent.

$x = 7$