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Domain and Range - Problem 3 7,337 views

Teacher/Instructor 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

Domain is the set of all x values and range is the set of all y values. Coordinate points are written as (x, y). To find the domain, list all the x values from the coordinate points. To find the range, list all the y values from the coordinate points. Repeated values in the domain or range do not need to be written more than once.

It's important that you guys are able to find the domain and range from a graph. Sometimes you're given little splattering of points like this in which case you can find the domain and range pretty easily. Keeping in mind the domain is the set of all x numbers so if I want to find the domain, I just want to look at the x values. -1, 0 and 2 it doesn't matter what order I put them in, there's my domain.

Range is the set of all y numbers, so I'll have -2, 2 and 1 it's just the y values from those points. That's it when you're asked to find domain and range and you're given a few discrete points, discrete meaning like separated from each other. Just look at the coordinates find the x numbers, those are your domain, find the range numbers those are your Ys it's not so bad.