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Introduction

Module by: Kenny M. Felder. E-mail the author

Summary: The introduction to the teacher's guide on functions.

This is the most important unit in the year, because it introduces many of the major “themes” that will run through the entire class. These themes include:

  • What is a function?
  • How are functions used to model things in the real world?
  • What does it mean for two functions to be “equal”?
  • How does a functional description f ( x ) = 3 x f(x)=3x relate to a graph?

More detailed topics include the vertical line test (the “rule of consistency”), the “dependent” and “independent” variables, domain and range, composite functions, and inverse functions.

Also included in this unit is a quick review of graphing lines. It is assumed that students are mostly familiar with this topic from Algebra I.

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Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

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Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

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