Precalculus Examples

$\ln (x) = 7.25$

Step 1

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

$e^{\ln (x)} = e^{7.25}$

Step 2

Rewrite $\ln (x) = 7.25$ 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 $b^{y} = x$ .

$e^{7.25} = x$

Step 3

Rewrite the equation as $x = e^{7.25}$ .

$x = e^{7.25}$

Step 4

The result can be shown in multiple forms.

Exact Form:

$x = e^{7.25}$

Decimal Form:

$x = 1408.10484820 \dots$