Direct proof

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  • เผยแพร่เมื่อ 12 ก.พ. 2020
  • Simple, easy to understand math videos aimed at High School students. Want more videos? I've mapped hundreds of my videos to the Australian senior curriculum at my website mathsvideosaustralia.com/

ความคิดเห็น • 12

  • @seyedali7990
    @seyedali7990 หลายเดือนก่อน +1

    Bro was not cooking in the last question

  • @notericok7695
    @notericok7695 4 ปีที่แล้ว +4

    The only video that I could understand fully about direct proofs. Thanks

  • @isaacbell1292
    @isaacbell1292 2 ปีที่แล้ว

    thx browski, this banger definitley made me pass math this term

  • @mrcute4584
    @mrcute4584 ปีที่แล้ว +1

    that doesn't imply that 2 of them are + numbers. inside of the parentheses could be negative and its square would be positive ..

  • @Sonya-lj3ms
    @Sonya-lj3ms 3 ปีที่แล้ว

    I appreciate this a lot thanks heap!!

  • @sebbretro
    @sebbretro 2 ปีที่แล้ว +2

    Hi, I am a bit confused with you assumption on the last example, as y could be negative and still allow the answer to be greater than 0

    • @tmac4849
      @tmac4849 ปีที่แล้ว

      They could possibly both be negative numbers and still give an answer >= 0. Eg If x=-3 and y=-1.

    • @HSJM-tr3pi
      @HSJM-tr3pi ปีที่แล้ว

      just seeing the comment now, he does say that in the question, both x and y are positive real numbers

  • @mrcute4584
    @mrcute4584 ปีที่แล้ว

    i didnt understand the last one

  • @chrischristensen5755
    @chrischristensen5755 4 ปีที่แล้ว

    so how are we supposed to solve the last one? you did not explain that very well at all

    • @JoelSperanzaMath
      @JoelSperanzaMath  4 ปีที่แล้ว

      Sorry it wasn't clear Chris. In that last question. To prove that last question, you just reverse the order in which I wrote my working. A false proof, is just a direct proof written backwards.

    • @tmac4849
      @tmac4849 ปีที่แล้ว

      That doesn't work because your last statement does not equal P