# Lesson Plan: Domain and Range of a Function Mathematics • 9th Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to identify the domain and range of functions from their equations.

#### Objectives

Students will be able to

• recall the definitions of the domain and the range of a function,
• identify the ordered pairs of a function given the domain, range, and equation of the function,
• identify the range of a function given the domain and the equation of the function,
• identify the domain of a function given the range and equation of the function,
• identify the domain and range of a discrete function and mapping diagram,
• identify the domain and range of a function given a graph of the function,
• identify the domain and range of a function given the equation of the function.

#### Prerequisites

Students should already be familiar with

• identifying, representing, and recognizing functions from descriptions, arrow diagrams, and graphs,
• function notation,
• set notation,
• representing relations,
• evaluating functions.

#### Exclusions

Students will not cover

• piecewise functions,
• rational functions.