What Is a Function? | Precalculus

This math video tutorial explains what a function is. It is a special relation where there is exactly one output for every input. This video explains how to evaluate a function and how to determine if a graph represents a function using the vertical line test.

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[dgangs]

I will by 40 year old this year, , and all these 40 years I was in guilt that I lacked the Basics. This has nothing to do with me now, but I still watch and practice your videos and try to be better thinking that I am back to school. Thank you so much. You are doing a great work here.

[technicallyyogi]

I literally cried seriously becoz his teaching was so clear and I know the basic for12 th grade so i am still doing my 11th amd 12th combine to study becoz i literally lost 11th becoz of COVid so I am learning. I am from india

[falcon]

It's been years since I took this and completely forgot how to read functions properly. Thanks for the super clear refresher 😊

[misguidedmiscreants]

TOCT: "A function is a relationship. A special kind of

Me: 😍💕awww how sweet💘💕

[FamKK]

4:10
no matter how much my teacher tired, i didn't understand sh8t
but Your vertical line method saved me

[PeachyKeenMaureen]

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[theklqueen]

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[tajuoni]

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[Snow-ejfm]

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[blessinghairworld]

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[miaash]

Maths teachers ought to watch your videos to learn how to teach!

[georgesadler]

MR. Organic Chemistry Tutor, thank you for a smooth and beautiful definition of a Function.

[asterixboy]

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[muhammadsaniwada]

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[jaydevsingh]

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[jiadotsomething]

I’m in 9th grade and we haven’t done this in school yet . So I literally don’t have a teacher to teach me this but because of how amazing this video is I instantly grabbed the concept

[deborahmuoki]

Finally 😭😭😭...I eventually got .Thank you soo soo Much🤩

[SharpCookie]

Great explanation! One of my students asked me why do we usually write "f(x), " and I'm guessing "f" stands for function...? I know g(x) is the other common notation.

[scaramouche_]

Im in 10th grade and you explained it better than my math teacher, Thanks so much 😁