## Reflection: Developing a Conceptual Understanding Domain and Range of Graphs Using Interval Notation - Section 4: Exit Slip

I purposely plan a problem in the Exit Slip for students to determine the domain and range of a function in which the arrow is slanted and not going in the left or right direction.  In this lesson, some students have difficulty determining domain and range from arrows.  Some students have difficulty understanding that negative infinity must be listed first in the interval, and then positive infinity.  In my previous lesson, on stating domain and range using set notation, I emphasize what students need to focus on using colored pencils in the Guided Practice.  For domain, students need to focus on how far left to how far right determines the graph, (the x's).  For range, students need to focus on how low the graph goes to how high it goes (the y's).

A Misconception
Developing a Conceptual Understanding: A Misconception

# Domain and Range of Graphs Using Interval Notation

Unit 1: Introduction to Functions
Lesson 5 of 13

## Big Idea: To have a deeper understanding of interval notation from inequalities and how the square bracket includes the number and the parentheses does not include it.

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Standards:
Subject(s):
Math, Algebra, Domain and range, interval notation, set builder notation, Video Notes, Immediate Feedback, function
50 minutes

### Rhonda Leichliter

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