Art of Problem Solving: Work Backwards

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  • Опубліковано 29 жов 2024

КОМЕНТАРІ • 24

  • @JanexConfetti
    @JanexConfetti 3 роки тому +6

    Watch this in 2x and you'll be laughing SO HARD

  • @0xCP
    @0xCP Рік тому +1

    was a great course

  • @johnedwards4394
    @johnedwards4394 2 роки тому +3

    I knew he was a mathematician, but I didn't know the Unabomber had his own UA-cam channel.

  • @43Cubes
    @43Cubes 3 роки тому +4

    "I like doing things backwards"
    *doesn't reverse video*

  • @dzhpo
    @dzhpo 4 роки тому +3

    I like how he just flips pages without really reading the book in the end.

  • @LouisReeds
    @LouisReeds 10 років тому +1

    Could you run over the brain cell problem to me via inbox? Its really quite difficult to comprehend, i didnt relly understand the part when it changes from 3 x / 2 and 5x / 4 ? just a bit hard to understand but im very interested

    • @lhommearme
      @lhommearme 3 роки тому +1

      Working backgrounds. We both have x brain cells at the end. This is a result of me giving you 1/3 of my brain cells. If I give you 1/3 of my brains cell, I will be left with 2/3. So at the end x for me is 2/3 of the brains cells I had before taking action. The reciprocal of 2/3 is 3/2. To undo my action we can compute the product of x and (the reciprocal) 3/2. Undoing the action I have 3x/2. We can now understand why you must have had x/2 before any action. 1/3 (3x/2) = x/2 and x/2 + x/2 = x.
      Now for the prior step where you give me 2/3 of your brain cells. x/2 is the 1/3 of your brain cells before giving me 2/3 brain cells. So before action, you must have had 3 (x/2) = 3x/2. 3 is the reciprocal of 1/3 that allows us to undo your action. The amount of brain cells you give me is 2/3 (3x/2) = "x". The "x" you give added to what I had resulted in 3x/2. x + ? = 3x/2 . We can solve for the unknown; we find x +x/2 = 3x/2. So I must have had x/2 before your action.
      Now for the beginning. After giving you 1/3, I am left with 2/3. Again the reciprocal is 3/2. We undo the action by computing 3/2 (x/2) = 3x/4. Meaning at the beginning I had 3x/4. I gave you 1/3 (3x/4) = x/4. x/4 + ? = 3x/2. We can solve for the unknown; we find x/4 + 5x/4 = 3x/2.

  • @weareprobablyinanarguement
    @weareprobablyinanarguement 2 роки тому

    I’m nostalgic now it has ended…

  • @dzhpo
    @dzhpo 4 роки тому +4

    I am still confused about how you give each other brain cells.

  • @pzeezy
    @pzeezy 9 років тому +3

    Isnt this guys the one who did the other videos?

  • @diorrat..0
    @diorrat..0 3 роки тому +1

    11:01
    Lol

  • @mildredduffie6587
    @mildredduffie6587 10 років тому +1

    IDK my anxiety just kicked up a notch after this Im still confused but I will listen and watch again maybe if you did this with a lil less extra it might help IJS :-)

  • @jemappellelanoosh1743
    @jemappellelanoosh1743 11 років тому +1

    Thanks a million man :)

  • @cardzdoiwant2
    @cardzdoiwant2 7 років тому +1

    Awesome for those who get it, but I bet there's a lot of people watching this thinking HUH?

  • @hoaxxx8789
    @hoaxxx8789 3 роки тому +1

    Why are you dressed like the Unabomber?

  • @ahmedfahims6741
    @ahmedfahims6741 10 років тому +1

    ok

  • @RyuandKen01
    @RyuandKen01 10 років тому +1

    This dude looks like Sam Rockwell

  • @davidshi330
    @davidshi330 11 років тому +3

    Good at math. Honestly, he does a horrible job in explaining the concepts.