Introduction to geometric sequences | Sequences, series and induction | Precalculus | Khan Academy

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  • Опубліковано 13 гру 2024

КОМЕНТАРІ • 315

  • @laurelcook9078
    @laurelcook9078 6 років тому +557

    I'm only now learning this in college calculus. You guys in 8th grade who know this deserve a medal or something.

    • @valorrye2342
      @valorrye2342 6 років тому +54

      I dunno how Thais and the Americans call their class by age, but I'm 13 and I'm already learning this. I was surprised to see that this is calculus.

    • @dakshbrar565
      @dakshbrar565 5 років тому +14

      @@valorrye2342 this is pre cal 30 for me lol

    • @jaspergu8054
      @jaspergu8054 5 років тому +10

      I’m in 6th

    • @layshatzita3715
      @layshatzita3715 5 років тому +17

      Lmao I'm in honors math in 8th grade and we're doing this 💀

    • @mufidhmuhsin2314
      @mufidhmuhsin2314 5 років тому +1

      Laurel Cook thanks lol

  • @dresthon
    @dresthon 4 роки тому +89

    Isn’t it so great being put into an advanced 7th grade math class so you can cry over this at 3am the day before a test

    • @MuhammadAhmed-oj5wc
      @MuhammadAhmed-oj5wc 3 роки тому +1

      Sadly in my school there are no sets or advanced stuff until I’m 15

    • @3NT1TYY
      @3NT1TYY 3 роки тому

      lol same i have to leasn htis stuff in grade 7

    • @broccolisalad9556
      @broccolisalad9556 2 роки тому

      Just wait till u learn functions :)

    • @jeffthevomitguy1178
      @jeffthevomitguy1178 2 роки тому

      @@broccolisalad9556 functions are more important tho.

    • @stephenzaccardelli5863
      @stephenzaccardelli5863 Рік тому +1

      Good starter for accumulation and differentiation. I remember this as a young teenager 35 years ago or more. Wow 😆

  • @Hammersmashedd
    @Hammersmashedd 8 років тому +369

    I should be paying you instead of my useless college.

    • @julymagma4433
      @julymagma4433 7 років тому +14

      what math level were you taking?

    • @marydmajors9627
      @marydmajors9627 5 років тому +12

      I am doing this in eighth grade!

    • @sus-ho6ck
      @sus-ho6ck 5 років тому +3

      @@marydmajors9627 Sameeeee

    • @utkarshbhardwaj7356
      @utkarshbhardwaj7356 3 роки тому +2

      @@marydmajors9627 okay so fine we are so proud of you that your are doing this in 8th . But if in future you choose suppose business administration you have a subject called business mathematics. In that subject these chapters are their. So the people who haven't revised or have not studied maths from from past 3-4 years might have a problem doing it . So for god sake dont show off

    • @isabellaj4295
      @isabellaj4295 3 роки тому

      @@marydmajors9627 samee

  • @stevenf6636
    @stevenf6636 5 років тому +14

    I have looked everywhere just to find out a non formal definition of a geometric sequence and you sir have rocked my world...

  • @speedybast494
    @speedybast494 10 років тому +155

    how can you write so well on a computer program!?!?!

    • @thomasdeng7659
      @thomasdeng7659 9 років тому +1

      +Speedy Bast
      I K R I tried writing tiny on paint(the app), I failed awfully

    • @Toxicblackmambahs
      @Toxicblackmambahs 8 років тому +19

      he's using a wacom...... Noob.

    • @mattias2576
      @mattias2576 5 років тому +1

      @@thomasdeng7659 probably not using a mouse....

    • @TLA-mj9ji
      @TLA-mj9ji 5 років тому +2

      Using a tablet to right on

    • @revadis2220
      @revadis2220 3 роки тому +1

      then how does he move the cursor without writing

  • @mialaure1
    @mialaure1 10 років тому +75

    Thank you, so much, literally I take 8th grade Algebra1 and this is all so new to me, and I move in a slow pace so I end up not understanding most of the topic and I end up having a hard time with it. But your video has made this so much clearer and I'm just so thankful right now :)

    • @sosman747
      @sosman747 7 років тому +1

      mialaure since when did ken kaneki study math?

    • @dakshmota3480
      @dakshmota3480 7 років тому

      The same exact thing is happening with me, but this helps a lot:):):)

    • @dododave1601
      @dododave1601 7 років тому

      8th Grade? I am learning this in 7th.

    • @dakshmota3480
      @dakshmota3480 7 років тому

      So did I but in my 8th grade class we are reviewing this again so we don't forget.

    • @dododave1601
      @dododave1601 7 років тому

      aww man i dont wanna do this next year

  • @jcurrell94
    @jcurrell94 11 років тому +32

    Found these while studying for finals. Will use these for the rest of my engineering math classes. Thank you Sal!

    • @lesandunishsanka
      @lesandunishsanka 20 годин тому

      After all of these years , You finally got a reply

  • @olgaslavkov3444
    @olgaslavkov3444 8 років тому +101

    When you don't even need your math teacher bc khan explains it better than your dad.

    • @naveedishtiaque
      @naveedishtiaque 5 років тому +5

      what?????

    • @simrahq4712
      @simrahq4712 5 років тому +8

      So is your dad your math teacher 😂?

    • @PK-uj8mp
      @PK-uj8mp 5 років тому +14

      Dad explains better with a belt

    • @blacktaildeer2484
      @blacktaildeer2484 4 роки тому +4

      My dad explains it better. But he's not here with us now... so i have no choice but to use Khan academy.

    • @Dxk1038
      @Dxk1038 Рік тому +2

      bro called he’s teacher and dad out 💀💀

  • @박시우-p6q
    @박시우-p6q 6 років тому +38

    0:52 feat. a mosquito

  • @sleepingkenny206
    @sleepingkenny206 5 років тому +28

    anyone else feel in love with this guys voice

    • @toraOniku
      @toraOniku 4 роки тому

      Ohh I have been watching so many videos just to hear his voice...

    • @shoaibKhan-gg4wj
      @shoaibKhan-gg4wj 4 роки тому

      @@toraOniku uh u good bro

    • @toraOniku
      @toraOniku 4 роки тому

      @@shoaibKhan-gg4wj lmao I'm not sure-

    • @luisseisabelb.torion6186
      @luisseisabelb.torion6186 4 роки тому

      lmao i thought i was the only one

  • @calen_chan
    @calen_chan 12 років тому +36

    I was just going to say the same thing! You beat me to it. :)

  • @Goofmobber
    @Goofmobber 12 років тому +14

    Whenever I hear your voice explaining a subject, I already feel better about it... :D

  • @Raza__12
    @Raza__12 9 років тому +30

    Your voice is so clam and soothing Khan. I smile the whole time when I am watching your videos. 😄

    • @MrRagerrKSG
      @MrRagerrKSG 7 років тому +2

      subhan raza Khan is a math program .. not him

    • @Raza__12
      @Raza__12 7 років тому +3

      Ivan Andaluz His name is Salman Khan and he goes by Khan.

    • @mays9173
      @mays9173 7 років тому +3

      Thats one of his employees, he doesnt actually explain this stuff. He's the CEO he has no time.

    • @valorrye2342
      @valorrye2342 6 років тому +1

      @@mays9173 www.google.com/search?q=khan+academy&rlz=1C1JZAP_enTH729TH730&oq=Khan+&aqs=chrome.0.0j69i60l2j69i57j69i60l2.2004j1j1&sourceid=chrome&ie=UTF-8
      wow...

    • @olivia_chen
      @olivia_chen 19 днів тому

      his employees make videos as well, but not as much as him, most of the video explaination were done by him when he started the channel

  • @giannaphillippi1898
    @giannaphillippi1898 5 років тому +9

    If i could just sit down in a class with you and you were my teacher, I might not be failing!

  • @liquidjorge
    @liquidjorge 10 років тому +49

    who the hell dislikes this videos?!

    • @juvenoiachild7675
      @juvenoiachild7675 9 років тому +3

      +liquidjorge i did

    • @juvenoiachild7675
      @juvenoiachild7675 9 років тому +1

      because fuck math

    • @juvenoiachild7675
      @juvenoiachild7675 9 років тому

      Well little boy I you must know I came here because I forgot how to do this in school 2 weeks ago. I looked it up. There is your life fully complete now? Will you sleep easy?

    • @juvenoiachild7675
      @juvenoiachild7675 9 років тому

      Im done with you

    • @michaeldinh2449
      @michaeldinh2449 8 років тому +12

      +Captain Spoofy Holy crap I just found the stupidest person on this comment section.
      "Man I really need help with my Math work, I'll look up some guides and tutorials online to help me with that problem and then dislike the video because I don't like the subject."

  • @mariyah7236
    @mariyah7236 3 роки тому +16

    I literally stopped paying attention for a second an now I'm lost

  • @lanazenney3700
    @lanazenney3700 11 років тому +7

    thank you for saving me during junior year. you rock.

  • @rap4ever12
    @rap4ever12 14 років тому +6

    omg!!! just in time sal!!! my class is doing arithmetic sequence and soon geometric sequence soon... thank you soo much

    • @pianodna-james3147
      @pianodna-james3147 3 роки тому

      10 years ago comment and a 10 month ago reply, wow

    • @monikagupta4185
      @monikagupta4185 2 роки тому

      Ohh ny god guy you an og .. i would be shocked if you reply

  • @MagICskattER
    @MagICskattER 12 років тому

    Sometimes i think of bunking class and sitting on UA-cam and stare at Khan Academy Videos
    all the time!!!!
    FUN, UNLIMITED PRACTICE AND BETTER KNOWLEDGE!!!!
    Easy to Grasp.....

  • @SirArsenic
    @SirArsenic 12 років тому +2

    such an elegant hand writing

  • @aramanthine
    @aramanthine 6 років тому +16

    Sir, I would like you to be my math teacher.

  • @snyclan8637
    @snyclan8637 3 роки тому

    this man saved me in 8th grade 100%. You're my savior.

  • @mrart2252
    @mrart2252 5 місяців тому +1

    10 mins of yt classes = 1hr of schooling classes

  • @zack_120
    @zack_120 3 роки тому

    2:42- This is how humans make mistakes where the last term should be 10/9, not 10/3!

  • @aasserihab4262
    @aasserihab4262 4 роки тому +1

    best math teatcher

  • @crossfire818
    @crossfire818 4 роки тому

    your better then any math teacher!!!!

  • @Daski69
    @Daski69 11 років тому +12

    shouldn't the 12th jump be the function of: 120 x 0,6^11 and not ^12? :S

    • @sofia1534
      @sofia1534 5 років тому

      Daskie69 why? I have a test tomorrow please explain...

    • @seminawahab5754
      @seminawahab5754 5 років тому

      @@sofia1534 no

    • @kjca7890
      @kjca7890 4 роки тому +4

      Uhhh u shouldnt interchange the word used "bounce" to word "term" it says 12th bounce not the 12th term in the series. I hope its not too late for me 2 help u

  • @unrivaled37
    @unrivaled37 14 років тому

    thank you very much! from San Salvador, El Salvador (Central America)!!

  • @supreme_hehe
    @supreme_hehe 4 роки тому +1

    Hey sal khan I am your biggest fan and of salman khan also 😁
    I just wanted to say that at 2:41 it should be 10/9
    Ops I'm sry you corrected yourself at 3:04

  • @Legendaryhutch
    @Legendaryhutch 8 років тому +2

    Thank you so much for this, I didn't understand Geometric but this helped me to understand it clearly.

  • @darkblader061
    @darkblader061 12 років тому +2

    watch the full video, he corrected it at 3:08

  • @mervynwinn1852
    @mervynwinn1852 5 років тому +3

    this is surprisingly simple and I'm in 9th grade

  • @D4NIB4BE
    @D4NIB4BE 12 років тому +1

    I like how you used the table to show your work. So you were using a geometric explict form right? I am teaching myself some math courses to challange an exam so I can go to back to school for mechanical engineering ^.^ Thanks for the hard work!

  • @Unname-k3r
    @Unname-k3r Рік тому

    Let Allah reward you in the world life and in the last life

  • @matthewmorales1798
    @matthewmorales1798 7 років тому +2

    this guy is the truth
    BEST SERVICE

  • @amberproctor3996
    @amberproctor3996 10 років тому +2

    thank you!!! your video's really help!!!

  • @exce11er
    @exce11er 14 років тому

    I have a test on geometric sequences on MONDAY!!! PERFECT TIMING SAL!!!

  • @quinndelano8837
    @quinndelano8837 7 років тому

    oh, if only the website still had the old videos. they are so much better than the new ones.

  • @Decco6306
    @Decco6306 4 роки тому

    This seems useful for compounding interest

  • @Aretim5882
    @Aretim5882 3 роки тому

    Great job Khan. This is why that I have to go to bed early for this. I still had to get some rest for geometric sequence Tomorrow hopefully.

  • @ThePrincessa331
    @ThePrincessa331 8 років тому +12

    Gonna pass my final because of this👏🏽

  • @dieforyou8857
    @dieforyou8857 4 роки тому +6

    i feel like my brain is still stuck in grade 7
    i can never understand this unless I solve like 50 questions on it :(

  • @shaashwatlabde
    @shaashwatlabde Рік тому

    This was very helpful thank you

  • @Moon-x3t
    @Moon-x3t Рік тому

    Thankyou once again siiiir ❤

  • @gleichzilibertia1977
    @gleichzilibertia1977 12 років тому +1

    In my opinion, School just only a places where we attended to keep out and be socialization.

  • @NoHemlockForMe
    @NoHemlockForMe 6 років тому +6

    Shouldn’t the 12th bounce raise to the 11th power?

    • @PabloEnoc01
      @PabloEnoc01 5 років тому +1

      yes, the correct answer is 0.435356

    • @bamachikaboi
      @bamachikaboi 5 років тому

      not if you start from 0

  • @dapp_er
    @dapp_er 4 роки тому

    Thank you sir ❤❤

  • @sorianoarianne3121
    @sorianoarianne3121 4 роки тому +1

    i sat down for one hour and learn nothing but learned everything in 10 minutes ?! then my dad explained the rest, why am i going to school even

  • @pause-itivevideos
    @pause-itivevideos 2 роки тому +1

    i undersand what your teaching, but it seems like my questions are different!
    A1= 20, R = -0.07 ???

  • @PowerofDreamsHONDA1
    @PowerofDreamsHONDA1 11 років тому +1

    I love this guy

  • @danyalshah9819
    @danyalshah9819 4 роки тому +2

    Still confused about the zeroth bounce .......it should be (0.6)11×120 rather because starting from 0 the 12 bounce will be the 11th one

  • @RASTA510420
    @RASTA510420 10 років тому +1

    Thank you!! this helped me a lot :D

  • @Brownsuga1290
    @Brownsuga1290 8 років тому

    great refresher

  • @franciosmarchendie3218
    @franciosmarchendie3218 7 років тому

    sir ur just amanzing........!!!!

  • @biancastonge5167
    @biancastonge5167 8 років тому

    This helped me so much!

  • @Justdofacts
    @Justdofacts Рік тому

    Bro I don't really care about math, but my math teacher is giving me a test on sequences and she doesn't how to teach, so thank you

  • @mohammedamraltamer5431
    @mohammedamraltamer5431 3 роки тому

    Thank you helped alot

  • @ultrasupergod1207
    @ultrasupergod1207 4 роки тому +1

    Anyone watching this in quarantine?

  • @gordonlove144
    @gordonlove144 4 роки тому

    I had just typed "5th term should be 10/9" whwn you corrected it. :-)

  • @liamkelly2191
    @liamkelly2191 10 років тому +6

    anyone notice he did 0.6^12 instead of 12-1

    • @iluvdogs777
      @iluvdogs777 10 років тому +3

      It's supposed to be like that because this problem doesn't need an n-1 since it starts at 0

    • @emmanuelromero1946
      @emmanuelromero1946 9 років тому +1

      So for the 2 bounce it would be n-2?

    • @LoLTime143
      @LoLTime143 9 років тому +1

      +Emmanuel Romero 1 on n-1 is constant. The n is the bounce

  • @sethywethyt
    @sethywethyt 4 роки тому

    6:20 Strelch🤚🏼

  • @jenniferbyler2849
    @jenniferbyler2849 4 роки тому +1

    Anyone else's Siri went off when he said "series"... Just me? 😂

  • @Lalalalacee95
    @Lalalalacee95 12 років тому

    I get it, but my math book confuses me??? Oh well, at least I get it! This really helped a lot! Thought I missed a lot of stuff, because I sit in the back of class and have poor eyesight, :(((( Now it makes sense.

  • @kultome
    @kultome 12 років тому

    -10/3 x -1/3 is equal to 10/9 mr. khan. 02:58

  • @NapoleonTotal
    @NapoleonTotal 8 років тому

    thanks Khan

  • @unrivaled37
    @unrivaled37 14 років тому

    continue doing these videoss I think they are very helpfull!

    • @bekboy2446
      @bekboy2446 Рік тому

      you have a job naw isnt it

  • @GOODBOY-vt1cf
    @GOODBOY-vt1cf 4 роки тому

    thank you so much

  • @sunandaguru6133
    @sunandaguru6133 5 років тому +14

    Dude...sorry I can't resist reading comments

  • @LiamHarrington97
    @LiamHarrington97 11 років тому

    Very helpful!

  • @rathin204
    @rathin204 12 років тому

    I wish you were my Maths Teacher :)

  • @shambles6313
    @shambles6313 3 роки тому

    very good vid
    thanks

  • @ashifye
    @ashifye 13 років тому

    awesome vid!

  • @tanmaysrivastava4454
    @tanmaysrivastava4454 4 роки тому +1

    For the 100000000000000000000000000 bounce it would be [(0.6)^100000000000000000000000000]*120 which is ~ 0 so that means rope doesn't have a length, how did Anne jump?
    They should have given that bounce happens certain times....
    Please correct me if I am wrong

  • @junaidmusabbir9194
    @junaidmusabbir9194 7 років тому

    Thanks a lot!

  • @francescalynch4397
    @francescalynch4397 6 років тому +2

    anyone else cramming gcse maths hella last second lmao

  • @HotPepperLala
    @HotPepperLala 14 років тому

    Do some converges/divergence tests videos

  • @lofylii
    @lofylii 2 роки тому

    LMAO I GOT CONFUSED AT 10/9 I THOUGHT IT WAS REALLY 10/3

  • @jude713
    @jude713 Рік тому

    skipped the day before a quiz cause of dirt bikes and still gonna pass thanks homie 😂

  • @shadocodes5040
    @shadocodes5040 5 років тому +3

    This didn’t even cover finding the general term of a geometric sequence I am so boned😰 I can’t find a single video that actually helps.

    • @shadocodes5040
      @shadocodes5040 5 років тому +3

      I got a 77 on my test. My grade is not a 81%. Let’s hope my finals go well. I pray you all good luck in hopes you can understand stuff easily and succeed. Don’t give up even when it feels hard, because usually your effort will show!

    • @stormbreaker7667
      @stormbreaker7667 4 роки тому

      He did

  • @cavalos94
    @cavalos94 4 роки тому

    I'm a physics major junior watching this before taking math methods because I retained 0% of this when I first learned it.

  • @vericahchirwa5492
    @vericahchirwa5492 6 років тому

    thanks

  • @jacobmilton
    @jacobmilton 3 роки тому +1

    Great stuff! Loved the clarification of series and sequence.

  • @isaachayman9231
    @isaachayman9231 12 років тому +1

    Hey do you know how to do calculas?

  • @mmmnnn6024
    @mmmnnn6024 2 роки тому +1

    I'm in 11th grade and I have an exam on this tomorrow

  • @Trega2gamer
    @Trega2gamer 6 місяців тому

    Bruh this video popped up on my for you page and I’ve been out of high school for 6 years and I’ve been out of college for 2 years💀💀💀

  • @mood5709
    @mood5709 2 роки тому

    Thx

  • @_tony539
    @_tony539 7 років тому +1

    anybody know where i can get good arithmetic/geometric sequence exercises online?

  • @shenzi1118
    @shenzi1118 9 років тому

    Cool video.

  • @TuRnuAsian
    @TuRnuAsian 12 років тому

    1:53 common ralio ROFLS

  • @davidpeteraluko9376
    @davidpeteraluko9376 2 роки тому

    Guys that will be learning it in 7th grade Im learning this in 9th grade

  • @caetiadream8382
    @caetiadream8382 4 роки тому +1

    We’re doing this in 6th grade 😂😭

  • @AnneLingling
    @AnneLingling 8 років тому +4

    I'll pass the bungyjumping tho

  • @Jun-cz9cv
    @Jun-cz9cv 7 років тому +3

    when you understand the person in the internet than personal

  • @ColinCoils
    @ColinCoils 10 місяців тому

    I have a midterm tommorow for Algebra with alot of this in it, I will be back to say if I passed 😂

  • @ltp620
    @ltp620 12 років тому

    thx dude

  • @sougatadeb1977
    @sougatadeb1977 6 років тому

    Dear Mr Khan in the video geometric sequences at 3.03 minutes, won’t the number be 10/9? Am I wrong in interpreting?

  • @divyanshiyadav3709
    @divyanshiyadav3709 6 років тому

    Most indians should learn here if they don't know whats going in there classes

  • @danieldrewbustillos3380
    @danieldrewbustillos3380 4 роки тому

    10:31 isnt it the n should be 11? Because its 12-1? Im confused

  • @754759119
    @754759119 9 років тому

    what a mass, but i understand better.

  • @ShreyasChhabra
    @ShreyasChhabra 7 років тому +1

    So if the sequence starts with 0, you dont have to put the -1 in the formula??