Algebra Examples

$f (x) = 2 - \frac{3}{x - 1}$

Step 1

Set the denominator in $\frac{3}{x - 1}$ equal to $0$ to find where the expression is undefined.

$x - 1 = 0$

Step 2

Add $1$ to both sides of the equation.

$x = 1$

Step 3

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

Interval Notation:

$(- \infty, 1) \cup (1, \infty)$

Set-Builder Notation:

${x | x \neq 1}$

Step 4

The range is the set of all valid $y$ values. Use the graph to find the range.

Interval Notation:

$(- \infty, 2) \cup (2, \infty)$

Set-Builder Notation:

${y | y \neq 2}$

Step 5

Determine the domain and range.

Domain: $(- \infty, 1) \cup (1, \infty), {x | x \neq 1}$

Range: $(- \infty, 2) \cup (2, \infty), {y | y \neq 2}$

Step 6