Algebra 1 Interval Notation
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Interval Notation

 

 When we write an equation like ...

 

 
 people should know what we mean.
 
 If they don't, we can draw then a picture ...
 

 
 You would think that would be enough ways to show this.
 Well, think again.
 It seems like math people are never satisfied with this stuff.
 Here's another way to write it ...
 

 [-2, 5)

 
 This is called interval notation.
 What you do is list the numbers 
 at the ends of the area that is shaded in the picture.
 
 If the endpoint is included,
 you use a square bracket on that side.
 
 If the endpoint is not included,
 you use a curved bracket on that side.
 
 If the shaded area goes to plus or minus infinity,
 that side always gets a curved bracket.
 
 So:

 

   copyright 2005 Bruce Kirkpatrick

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