Functions - Cool math Algebra Help Lessons - What's a Function? (Intro to Domain and Range)

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Coolmath Algebra
Functions Lesson 1 - What's a Function? (Intro to Domain and Range) (page 3 of 5)
---- This algebra lesson explains the concept of a function and introduces the concepts of domain and range

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Let's try a box with some numbers in it:

THE RULE: Add 1

input -> rule: +1 -> output

What can we put in this box?

input: 3 -> rule: + 1 -> output: 4 ... input: pi -> rule: + 1 -> output: pi + 1

We can put anything in this box -- even goofy irrational numbers like ! So...

domain = all real numbers

range = all real numbers

Continued on the next page

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