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Domain and Range  Concept
Alissa Fong
Alissa Fong
MA, Stanford University
Teaching in the San Francisco Bay Area
Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts
An important part of understanding functions is understanding their domain and range. Domain and range are all the possible xvalues and yvalues of the function, and can often be described easily by looking at a graph. In order to grasp domain and range, students must understand how to determine if a relation is a function and interpreting graphs.
The ideas of domain and range are some of
the most important math ideas that to see
in your upcoming math classes.
It's really important that you guys start
thinking about domain as the set of
all possible X values or input values and
the range as a set of all possible
Y values or output values.
And you want to be able to find the domain
and range not only from like a set
of points but also to be able to find
the domain and range from a graph
where it might just be like a little
splattering of points.
Domain and range show up in lots of different
places and that's why it's important
that you keep those two ideas
straight in your head.
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Alissa Fong
M.A. in Secondary Mathematics, Stanford University
B.S., Stanford University
Alissa has a quirky sense of humor and a relatable personality that make it easy for students to pay attention and understand the material. She has all the math tips and tricks students are looking for.
Your tutorials are good and you have a personality as well. I hope you have more advanced college level stuff, because I like the way you teach.”
Thanks alot for such great lectures... I never found learning this easier ever before... keep up the great work.... :)”
You seem so kind, it's awesome. Easier to learn from people who seem to be rooting for ya!' thanks”
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Sample Problems (6)
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Domain and Range
Problem 1 13,378 viewsFind the Domain and Range:
x y 1 4 2 8 3 12 4 16 
Domain and Range
Problem 2 9,042 viewsFind the Domain and Range:
{(1,½),(2,1),(3,3⁄2),(4,2)} 
Domain and Range
Problem 3 8,297 views 
Domain and Range
Problem 4 8,321 views 
Domain and Range
Problem 5 445 views 
Domain and Range
Problem 6 376 views
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