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

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  • Опубликовано: 23 дек 2024

Комментарии • 191

  • @mackyb7561
    @mackyb7561 9 лет назад +60

    This guy has saved me SO MANY TIMES for 5 years now, THANK YOU!!!!!!!!!! (Best math videos EVER!!)

  • @StrewthFroogals
    @StrewthFroogals 8 лет назад +225

    "NINENINENINENINENINENINE" I burst out laughing when he said that

    • @BL0NDED2K
      @BL0NDED2K 7 лет назад +13

      Dare NEIN NEIN NEIN NEIN NEIN NEIN

    • @turkishandmore798
      @turkishandmore798 5 лет назад +3

      Dare i felt a lil conscious about the fact of mentioning something like this for it stands out to be silly to the idea being strictly explained but i laughted the hecks out on this tooooo 😂😂😂😂😂😂

    • @celestialorb1680
      @celestialorb1680 4 года назад

      Where is that?

    • @studiess5977
      @studiess5977 3 года назад

      Don't lie for likes

    • @celestialorb1680
      @celestialorb1680 3 года назад

      Studies s no for real kid where is it?

  • @TheDanimatorsChannel
    @TheDanimatorsChannel 8 лет назад +67

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

  • @erikaagrisel
    @erikaagrisel 8 лет назад +173

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

  • @Frodo_Shaggins
    @Frodo_Shaggins 6 лет назад +281

    Can you replace my Pre-Calc teacher?

  • @lisaheesters4508
    @lisaheesters4508 4 года назад +46

    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.

  • @freddielopezjr.5448
    @freddielopezjr.5448 8 лет назад +16

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

  • @eve2474
    @eve2474 4 года назад +1

    and this is why i LOVE khan academy

  • @aayushrana5812
    @aayushrana5812 3 года назад +1

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

  • @asiwornufrank1491
    @asiwornufrank1491 5 лет назад +1

    God bless you man you are my saviour

  • @mahmed109
    @mahmed109 2 года назад +1

    So my teacher took 2 hours to explain this from which I didn't understand half of it and this guy explained it in 9 minutes??

  • @NiGHT5043WiND
    @NiGHT5043WiND 6 лет назад +7

    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.

  • @9ball179
    @9ball179 6 лет назад +14

    Sal, my lord and saviour, I now understand

    • @sukeynarules7754
      @sukeynarules7754 3 года назад

      I still don't i don't even know anything we done in class this whole month im doomed

  • @leonardobarrera2816
    @leonardobarrera2816 Год назад +1

    I am exactly the 4000 like!!!

  • @yaelmshitrit
    @yaelmshitrit 3 года назад

    MOST HELPFUL THING GOD MADE ON EARTH

  • @upekshad5765
    @upekshad5765 4 года назад +1

    Oh you are my lifesaver when it comes to maths🙏

  • @CanOfCatfood
    @CanOfCatfood 5 месяцев назад

    My university lecturer spent an hour explaining intervals and you explained it in 10 minutes

  • @zerocodm5557
    @zerocodm5557 2 года назад +1

    ur the best!!!!!!

  • @008alikhan4
    @008alikhan4 6 лет назад +3

    Good explainantion

  • @sedanurna6239
    @sedanurna6239 8 лет назад +8

    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!

  • @affyne
    @affyne 3 года назад +2

    most straightforward and specific explanation on intervals, thanks!

  • @JoeEnjoyment
    @JoeEnjoyment 7 лет назад +2

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

  • @nichowll
    @nichowll 4 года назад +1

    This is clearer than what my 10th grade math teacher taught us.

  • @gio4cid635
    @gio4cid635 4 года назад

    Quarantine got me a better teacher

  • @nguyener14
    @nguyener14 5 лет назад +2

    Thank you so much! I was so confused before

  • @GoumenPouSawKwè2008
    @GoumenPouSawKwè2008 6 лет назад +3

    That's some beautiful stuff.

  • @godlychild7925
    @godlychild7925 6 лет назад +4

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

  • @zezul2463
    @zezul2463 7 лет назад +48

    If you change the speed to 0.5 from 4:14 - 4:23, you will notice that Sal drank one too many before the making of this video

    • @nuzlock4481
      @nuzlock4481 4 года назад +2

      Lmao 😂 underrated

    • @Will49103
      @Will49103 4 месяца назад

      0.25 is even better

  • @resizeBG
    @resizeBG 9 лет назад +3

    Thank you!

  • @AdamsGoingGhost
    @AdamsGoingGhost 3 года назад

    Wish I had profs like this!

  • @amanatazizkhan8765
    @amanatazizkhan8765 3 года назад +2

    Excellent and easy to understand - as always...thank you Khan Academy!!!!!!

  • @ganapathynaikar1075
    @ganapathynaikar1075 6 лет назад +3

    thanks alot sir awesome video
    all doubt cleared

  • @golden_cupcake0241
    @golden_cupcake0241 7 лет назад +3

    awesome this helped me so much!!!!!!

  • @laurenulyashkin2600
    @laurenulyashkin2600 5 лет назад +5

    Best video I have found for this. Finally clicked, thank you XD I need all the special help lmao.

  • @salmansaeed9278
    @salmansaeed9278 3 года назад +2

    The concept was explained in the best way possible.
    Loved it and thank you.

  • @moonshatter785
    @moonshatter785 10 месяцев назад

    Your the only way I'm getting through IB math :3

  • @larissaacosta6139
    @larissaacosta6139 5 лет назад +1

    Helped a lot thank you

  • @garrettzaporowski1035
    @garrettzaporowski1035 8 лет назад +9

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

  • @lilianacrivera
    @lilianacrivera 8 лет назад +1

    this helped me so much! God bless your soul!

  • @calebsatsi
    @calebsatsi Год назад

    Thanks Sal. You saved me.

  • @tengxingsheng6335
    @tengxingsheng6335 7 лет назад +1

    nice video , it's help alot

  • @boombaam8629
    @boombaam8629 3 года назад

    You are a legendary teacher

  • @silvia5306
    @silvia5306 8 лет назад +1

    I like this video. Had a hard time understanding this but now its clear. Hopefully I pass my test now.

  • @JORDANJOESHAWN
    @JORDANJOESHAWN 7 лет назад +1

    Helped clarified ALL of my problems that I had!

  • @zionfultz8495
    @zionfultz8495 2 года назад

    Sal used some set theory notation, nice!

  • @kingnucleiiyt6060
    @kingnucleiiyt6060 Год назад

    2:16 Congratulations Khan, you created a new word "mathy"

  • @sto2779
    @sto2779 2 года назад

    Excellent explanation... set notion math is literally like doing computer programming on paper for humans to compute.

  • @mahmudamim2040
    @mahmudamim2040 4 года назад +3

    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.

  • @joarlemarcial8220
    @joarlemarcial8220 9 лет назад +4

    thank you so much!

  • @DogeFrom2014
    @DogeFrom2014 9 лет назад +31

    Woah is it only me or did his voice change??

    • @Swermie
      @Swermie 8 лет назад +2

      Kind of sounds like Jeff Bridges, but less country boy in his voice.

    • @DogeFrom2014
      @DogeFrom2014 8 лет назад +1

      Buttered pAWPcorn So an Indian Jeff Bridges eh

    • @chrissyp6775
      @chrissyp6775 4 года назад

      @Charlie Robertson *Bangladeshi American

  • @DANOVERBOARDvlogs
    @DANOVERBOARDvlogs 7 лет назад +2

    Perfectly clear. Thank you!

  • @andresgaona4813
    @andresgaona4813 5 лет назад +3

    What is the software you use for this videos? Thanks!

  • @محمدقاسم-ذ9ي7ق
    @محمدقاسم-ذ9ي7ق 8 лет назад +1

    Perfect explain,Thanks

  • @widrawdi3499
    @widrawdi3499 5 лет назад

    Thank youuuu♥️♥️♥️♥️

  • @sessaasessaa3262
    @sessaasessaa3262 2 года назад

    Thank you 💜🎂
    God bless you and you have a good day 💕

  • @ZariZari0.0
    @ZariZari0.0 4 года назад

    I love you teacher

  • @Donkking8
    @Donkking8 8 лет назад +5

    Is [4,4] and interval? My basic understanding of an interval is that it's just stuff between two points or values. So I don't get how something like [1,2]intersection[2,3] is an interval? Isn't that just the set {2}?

  • @danushjayakumar1964
    @danushjayakumar1964 2 года назад +1

    Excellent and distinct explanation and repeated. I really appreciate this effort...thank you!🎉🎉😊

  • @aleksandragaliganova8009
    @aleksandragaliganova8009 8 лет назад

    thank you soooo much khan academy this helped me soooooo much

  • @gitkrishna
    @gitkrishna 5 лет назад

    thank you khan acedmy

  •  3 года назад

    Great video, thanks

  • @robertogiammattei881
    @robertogiammattei881 8 лет назад +1

    Thanks dude

  • @MSFR-911_
    @MSFR-911_ 3 года назад

    سبحان الله وبحمده سبحان الله العظيم
    استغفر الله العظيم الذي لا إله إلا هو الحي القيوم و أتوب إليه
    سبحان الله وبحمده عدد خلقه ورضا نفسه وزنة عرشه ومداد كلماته
    اللهم صَلِّ وسَلّمْ عَلَى نَبِيْنَا مُحَمد ﷺ

  • @warmachine9638
    @warmachine9638 9 лет назад +1

    Thanks man!

  • @shadmanchowdhury6649
    @shadmanchowdhury6649 8 лет назад

    Thanks It helped alot for me to do myy h/w

  • @gabrielfabian2534
    @gabrielfabian2534 8 лет назад +3

    aw, thanks so much! may i just ask what program are you using?

  • @sethp7369
    @sethp7369 8 лет назад +1

    thank you sssooo much

  • @jaydacortez7323
    @jaydacortez7323 4 года назад

    Thankss !!

  • @Abdulla_hersh03
    @Abdulla_hersh03 5 лет назад

    Thank you 💕🙏😌🙏💗

  • @shekhar6803
    @shekhar6803 6 лет назад +3

    Why do we use closed bracket at infinity??

    • @boushrahaidar4733
      @boushrahaidar4733 4 года назад

      you don't know what is the number but when it is determined like x less than or equal 2 so 2 needs bracket then it is going to be paranthesis negative infinity ;2 bracket

  • @sneakybeja6583
    @sneakybeja6583 3 года назад +2

    What do you do when you have a number that is the same as the end point for your interval?
    like, 40 - 50 but there is a 50, and your next interval is 50 - 60? Do you include them both? or just the one on the left or right?

    • @boombaam8629
      @boombaam8629 3 года назад

      If 50 is included then you include them both 40-60

  • @matinhewing1
    @matinhewing1 7 лет назад

    Excellent tutorial...thanks!

  • @kaihiwatarigaming
    @kaihiwatarigaming 6 лет назад +2

    You are my best and now online teacher I want to look up if I'm up to learn something or get motivated by the hashtag #youcanlearnanythings

  • @princevegeta5907
    @princevegeta5907 4 года назад +4

    Is [-3, 2] equal to [2, -3]? Are they mathematically similar in properties of Cartesian coordinates?
    I am a math noob and would love some help.

    • @sagar-uj1nb
      @sagar-uj1nb 4 года назад

      definitely not they are not the same.

    • @princevegeta5907
      @princevegeta5907 4 года назад

      @@sagar-uj1nb Why? These are not coordinates. But show the scale between the 2 numbers.

    • @soobread9077
      @soobread9077 2 года назад

      No.
      Cartesian coordinates are represented by (x, y)
      Plot them on graph and they're obviously different.
      -3 comes first on the no. line before 2 so the correct way of writing is [-3,2].
      Use the number line to understand.

  • @b_a_fps1569
    @b_a_fps1569 5 лет назад +4

    I was looking for music theory😂

  • @fashionvella730
    @fashionvella730 Год назад

    listen on 2X at 4:08

  • @shahidabanu.m1793
    @shahidabanu.m1793 3 года назад

    Thank u sir

  • @matthewshannon7235
    @matthewshannon7235 9 лет назад +5

    he has an optical mouse

  • @CORE.001
    @CORE.001 3 года назад +2

    how will I write the interval notation of a number line with no graph at all?

  • @dreaplascencia
    @dreaplascencia 4 года назад

    Does this apply the same way to parabolas?

  • @sarahk.8786
    @sarahk.8786 6 лет назад

    thank you

  • @addisonbarton8757
    @addisonbarton8757 4 года назад +2

    it is 10:40 pm at night and im still working on homework, i havent even gotten to do any of my missing assignments and all of them are do tomorow. Guess whos defininetly getting kicked out of honors for the big fat D im getting in my Algebra class!!!!

  • @shokobata
    @shokobata 6 лет назад

    what about set notation can u make a video about that?

  • @monishtulsiani2898
    @monishtulsiani2898 8 лет назад +1

    tysm

  • @brylinsundae7464
    @brylinsundae7464 7 лет назад +1

    We can lose the 'x is a member of all real numbers' and just have -4

  • @harshshukla3744
    @harshshukla3744 6 лет назад

    Thanks

  • @ShadowMonarch6000
    @ShadowMonarch6000 7 лет назад

    So in this kind of problems, we can only express interval notations??

  • @lele_cchx2259
    @lele_cchx2259 Год назад

    what’s the name of orange and green interval please ? great video

  • @EmanAli-x3r
    @EmanAli-x3r Год назад

    kindly specify the notation for half closed and half open interval in this video.

  • @titzxall1427
    @titzxall1427 7 лет назад

    What is your writing software?

  • @cameronvidrine9465
    @cameronvidrine9465 7 лет назад

    This helped me so much. Thanks so much!

  • @Strawberrybeaches
    @Strawberrybeaches 11 месяцев назад

    explained more in nine minutes than my college professor did

  • @bindukhadka8051
    @bindukhadka8051 7 лет назад

    Nice!!!!!!!

  • @Razit_sarker
    @Razit_sarker Год назад

    does the Greek E represent belongs to? that is what i learned

  • @ALeith
    @ALeith 5 лет назад +3

    Who’s in 7th Gradeee.... help me

  • @Hannah-pk2sh
    @Hannah-pk2sh 4 года назад

    Wow this is so clear i was watching another video abt algebra and them be like now we apply - infinity and infinity me👀😳🤔🤔😕😔

  • @popcorngaming5278
    @popcorngaming5278 4 года назад

    so what will i use if a solution set is 0

  • @am.miran.
    @am.miran. 6 лет назад

    2:41 sir u said that sign is not epsilon in your previous video. And now you are saying it is.

  • @angelodeus8423
    @angelodeus8423 2 года назад

    what if there's more than one digit that is excluded from the interval?

  • @currentlyoffline3746
    @currentlyoffline3746 6 лет назад +3

    Me: *still doesn't understand*
    #YouCanLearnAnything
    -#YouCanLearnAnything-
    #YouCanLearnAnything
    #YouCanLearnAnything
    i cant