Today, we reviewed the topic "Domain & Range." The domain of a function is a set of numbers that defines a function. The domain is the first coordinate (or the x-value) of the pair.
Ex. (1,2) (2,4) (3,6)
The Range of a function is the set of all second coordinates of all ordered pairs of a relation. The range is the second coordinate (or y-value) of the pair.
Ex. (1,2) (2,4) (3,6)
We also reviewed on how to use interval notation. Interval notation uses round ( ) and square [ ] brackets to show when a number is included in a set or not included in the set. *note: Round brackets mean that the number isn't included in the set and square brackets mean the number is included in the set.
ex. [-2,1) The brackets indicate that -2 is included in the set, but 1 isn't included.
Now I will show a picture of a graph and then find the domain and range of the graph by using interval notation.
ex. Domain: [-infinity, +infinity]
Range: [-16, +infinity]
You can see that all the numbers are included in the set which means you use the square brackets to show that the numbers are included in the set.
Well that's pretty much all we learned in our Domain & Range review! hope this has helped everybody out. See you guys tomorrow! :D
My post looks cooler than Jessie Gamis' cause I have a picture.
I'm the one that told you where the picture box was though. :P.
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