Calculus Examples

$f (x) = \ln (x^{2} + 1)$

Step 1

Set the argument in $\ln (x^{2} + 1)$ greater than $0$ to find where the expression is defined.

$x^{2} + 1 > 0$

Step 2

Solve for $x$ .

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Step 2.1

Subtract $1$ from both sides of the inequality.

$x^{2} > - 1$

Step 2.2

Since the left side has an even power, it is always positive for all real numbers.

All real numbers

Step 3

The domain is all real numbers.

Interval Notation:

$(- \infty, \infty)$

Set-Builder Notation:

${x | x \in ℝ}$

Step 4