What is the domain of f(x) = x² + 2x + 1 ?

Domain is the set of x-values, or the "input"

Range is the set of y-values, or the "output"

As you'll notice in the graph,

**The domain {set of x-values} consists of**

all real numbers.

all real numbers.

The range {set of y-values} consists of

all real numbers greater than or equal to 0.

*- Algebra House*