Interval notation

[ ] a square bracket when we want to ___________ the end value, or In "Interval Notation" we just write the beginning and ending numbers of the interval, and use: [ ] a square bracket when we want to ___________  the end value, or Square brackets are like __________  ( ) a round bracket when we __________  Round brackets are like __________  include ≥ and ≤ DON’T < and >

Examples (5 , 12] means from 5 to 12, do not include 5, but does include 12 [6 , 10] means from 6 to 10, include 6 and does include Now you try: Come up with an example on your own

 (a, +∞)   __________ means x > a "greater than a“ __________ means x ≥ a "greater than or equal to a“ __________ means x < a "less than a“ __________ means x ≤ a "less than or equal to a" [a, +∞)  (-∞, a)  (-∞, a] 

[0, 6) 

(-5, 2] 

[-5, 7] 

[-2, -1) 

(3, 7]

[ 2, 9 ]

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Domain and Range Worksheet left right X Bottom top Y

(- ∞ , ∞ ) [-3, 3] [-2, ∞) [-3, 3]