Precalculus Examples

$\frac{2}{x} + \frac{x - 1}{x - 5}$

Step 1

Set the denominator in $\frac{2}{x}$ equal to $0$ to find where the expression is undefined.

$x = 0$

Step 2

Set the denominator in $\frac{x - 1}{x - 5}$ equal to $0$ to find where the expression is undefined.

$x - 5 = 0$

Step 3

Add $5$ to both sides of the equation.

$x = 5$

Step 4

The domain is all values of $x$ that make the expression defined.

Interval Notation:

$(- \infty, 0) \cup (0, 5) \cup (5, \infty)$

Set-Builder Notation:

${x | x \neq 0, 5}$

Step 5