Intervals and interval notation | Functions | Algebra I | Khan Academy

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Intervals describe specific sets of numbers and are very useful when discussing domain and range. In this video, Sal introduces the different types of intervals and their notations.

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Algebra I on Khan Academy: Algebra is the language through which we describe patterns. Think of it as a shorthand, of sorts. As opposed to having to do something over and over again, algebra gives you a simple way to express that repetitive process. It's also seen as a "gatekeeper" subject. Once you achieve an understanding of algebra, the higher-level math subjects become accessible to you. Without it, it's impossible to move forward. It's used by people with lots of different jobs, like carpentry, engineering, and fashion design. In these tutorials, we'll cover a lot of ground. Some of the topics include linear equations, linear inequalities, linear functions, systems of equations, factoring expressions, quadratic expressions, exponents, functions, and ratios.

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mackyb

This math video is great. Everything is well described and repeated and I like that. Thanks!

TheDanimatorsChannel

oh my gosh can you please replace my Algebra 2 teacher lol?

erikaagrisel

"NINENINENINENINENINENINE" I burst out laughing when he said that

StrewthFroogals

Hahaha I can't read titles. I watched about three minutes of this thinking it was about muscial intervals before going 'wait-'. Ah well, learned something new.

lisaheesters

Thank you so much on helping me understand this, my teacher talks way to fast for me to keep up and understand at the same time, you explain it more detail and I thank you for that.

NiGHTWiND

thank you so much I didn't understand my teacher when he explained it

freddielopezjr.

Omg this was great. The fact that you use so many example and repeat them makes me understand so much better! My school maths teacher is like a 2 compared to you lol. Thanks!

sedanurna

Yo, legit this guy can teach better than any other teacher. And I am literally talking about k-12, continuing to university.

aayushrana

THANK YOU!! Clear and easy to follow. Thank you for also showing the multiple ways to express the intervals.

godlychild

Thanks for the help, my teacher never taught us this but it was on the review.

garrettzaporowski

Thank you so much. You don't know how much this helps us students. God bless you so much!

JoeEnjoyment

Sal, my lord and saviour, I now understand

ball

most straightforward and specific explanation on intervals, thanks!

affyne

After this video ended, I just shouted "Thank you so much".
But sad, you aren’t going to hear this. I'm from Bangladesh..
So I was doing my homework.. My teacher finished this chapter year ago.. But I haven’t. Now I don’t want to knock for him for this petty question (not petty for me, definitely not).

THANK YOU SO MUCHHHH.

mahmudamim