Precalculus Examples

$\ln (x) - \ln (4) = 0$

Step 1

Use the quotient property of logarithms, $\log_{b} (x) - \log_{b} (y) = \log_{b} (\frac{x}{y})$ .

$\ln (\frac{x}{4}) = 0$

Step 2

To solve for $x$ , rewrite the equation using properties of logarithms.

$e^{\ln (\frac{x}{4})} = e^{0}$

Step 3

Rewrite $\ln (\frac{x}{4}) = 0$ 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 $b^{y} = x$ .

$e^{0} = \frac{x}{4}$

Step 4

Solve for $x$ .

Tap for more steps...

Step 4.1

Rewrite the equation as $\frac{x}{4} = e^{0}$ .

$\frac{x}{4} = e^{0}$

Step 4.2

Multiply both sides of the equation by $4$ .

$4 \frac{x}{4} = 4 e^{0}$

Step 4.3

Simplify both sides of the equation.

Tap for more steps...

Step 4.3.1

Simplify the left side.

Tap for more steps...

Step 4.3.1.1

Cancel the common factor of $4$ .

Tap for more steps...

Step 4.3.1.1.1

Cancel the common factor.

$4 \frac{x}{4} = 4 e^{0}$

Step 4.3.1.1.2

Rewrite the expression.

$x = 4 e^{0}$

Step 4.3.2

Simplify the right side.

Tap for more steps...

Step 4.3.2.1

Simplify $4 e^{0}$ .

Tap for more steps...

Step 4.3.2.1.1

Anything raised to $0$ is $1$ .

$x = 4 \cdot 1$

Step 4.3.2.1.2

Multiply $4$ by $1$ .

$x = 4$