Germany | A Nice Math Olympiad Algebra Problem

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  • Опубликовано: 12 янв 2025

Комментарии • 187

  • @DanielDimov358
    @DanielDimov358 5 месяцев назад +17

    x^2 + (3x/x-3)^2 = 16
    x^2 = 16 - (3x/x-3)^2
    x^2 = 4^2 - (3x/x-3)^2
    (4^2 - (3x/x-3)^2 - difference of squares)
    x^2 = (4 - (3x/x-3))(4 + (3x/x-3))
    After simplifying the expressions in the parentheses...
    x^2 = (x-12/x - 3)(7x - 12/x - 3)
    Using polynomial division...
    x^2 = (1 - (9/x-3))(7 + (9/x-3))
    Then let 9/x - 3 = a
    From this we can express the x = (9 + 3a)/a
    And we can substitute in the equation to get...
    ((9 + 3a)/a)^2 = (1 - a)(7 + a)
    (9 + 3a)^2/a^2 = -a^2 - 6a + 7
    (9 + 3a)^2 = a^2(-a^2 - 6a + 7)
    Expanding the parentheses we get...
    9a^2 + 54a + 81 = -a^4 - 6a^3 + 7a^2
    a^4 + 6a^3 + 2a^2 + 54a + 81 = 0
    a^4 + 8a^3 - 2a^3 + 9a^2 + 9a^2 - 16a^2 + 72a - 18a + 81 = 0
    a^4 + 8a^3 - 9a^2 - 2a^3 - 16a^2 - 18a + 9a^2 + 72a + 81 = 0
    a^2(a^2 + 8a + 9) - 2a(a^2 + 8a + 9) + 9(a^2 + 8a + 9) = 0
    (a^2 + 8a + 9)(a^2 - 2a + 9) = 0
    Roots of first equation are:
    a1 = -4 + √7
    a2 = -4 - √7
    Roots of second equation are:
    a3 = 1 + 2√2i
    a4 = 1 - 2√2i
    Using the roots of the first equation...
    x = 9 + 3(-1 + √7)/-4 + √7 = -1 - √7
    x = 9 + 3(-1 - √7)/-4 - √7 = -1 + √7
    ...after multiplying by the conjugate.
    Very long and unnecessary I know, however it is the way I solved it and I wanted to share it.

  • @michellewelchman9245
    @michellewelchman9245 7 месяцев назад +8

    I enjoyed your work and your explanation. Excellent and well done! These problems can be long and it took nearly three pages for this one! Lol Sometimes it feels like you're going down a math rabbit hole with no end but in the end when you do reach a solution (s) it's all good.

  • @NadiehFan
    @NadiehFan 7 месяцев назад +13

    A different approach which does not require a substitution and which does not require having to deal with fractions starts by multiplying both sides by (x − 3)² to get rid of the fraction. We can then proceed as follows
    x²(x − 3)² + 9x² = 16(x − 3)²
    x²(x² − 6x + 9) + 9x² = 16(x − 3)²
    x²(x² − 6x + 18) = 16(x − 3)²
    (x² − 3(x − 3) + 3(x − 3))(x² − 3(x − 3) − 3(x − 3)) = 16(x − 3)²
    (x² − 3x + 9)² − 9(x − 3)² = 16(x − 3)²
    (x² − 3x + 9)² − 25(x − 3)² = 0
    (x² − 3x + 9 + 5(x − 3))(x² − 3x + 9 − 5(x − 3)) = 0
    (x² + 2x − 6)(x² − 8x + 24) = 0
    x = −1 + √7 ⋁ x = −1 − √7 ⋁ x = 4 + 2i√2 ⋁ x = 4 − 2i√2

    • @laurentbeyer2458
      @laurentbeyer2458 7 месяцев назад

      I would have done same 👍🏻

    • @TapanDas-ei3lw
      @TapanDas-ei3lw 7 месяцев назад

      You're also a great genius ❤❤❤

    • @anjalidilipogale4208
      @anjalidilipogale4208 6 месяцев назад

      More simpler

    • @DanielDimov358
      @DanielDimov358 6 месяцев назад

      Where does line №4 come from?

    • @NadiehFan
      @NadiehFan 6 месяцев назад

      @@DanielDimov358 If you have two quantities a and b then their average is ½(a + b). Since a and b are equidistant from their own average, you can get the original quantities back by adding half their difference ½(a − b) to their average and by subtracting half their difference from their average. That is, we have
      a = ½(a + b) + ½(a − b)
      b = ½(a + b) − ½(a − b)
      The average of x² and x² − 6x + 18 is half their sum, which is x² − 3x + 9 = x² − 3(x − 3) and their difference is x² − (x² − 6x + 18) = 6x − 18 = 6(x − 3) so half their difference is 3(x − 3). Therefore, we have
      x² = x² − 3(x − 3) + 3(x − 3)
      and
      x² − 6x + 18 = x² − 3(x − 3) − 3(x − 3)
      Consequently, the product x²(x² − 6x + 18) can be written as
      (x² − 3(x − 3) + 3(x − 3))(x² − 3(x − 3) − 3(x − 3))
      and applying the difference of two squares identity (a + b)(a − b) = a² − b² this gives
      (x² − 3(x − 3))² − 9(x − 3)²
      or
      (x² − 3x + 9)² − 9(x − 3)²

  • @ajmiller7102
    @ajmiller7102 7 месяцев назад +6

    Excellent. Straight to the solutions. Well done!

  • @jahangirkhan1739
    @jahangirkhan1739 5 месяцев назад +10

    If I watched a few videos like this, I would be mentally ill. 😂😂😂

    • @annoint3d2mvu
      @annoint3d2mvu 4 месяца назад

      Me and you my friend, me and you!
      And the biggest question is when is this used in the real world?😅😅😅

    • @milosspanka4256
      @milosspanka4256 3 месяца назад

      ​@@annoint3d2mvumožno pri pristávaní rakety spoločmnosti X-space 😂 ale aj Albert Einstein je rád , že to nemusí počítať ... 😅😂😂

  • @OlajiireTaiwo
    @OlajiireTaiwo 4 месяца назад +3

    Please always make your solution simple, to the subject interesting to all, first clear the squares and solve within a minute

  • @Georg.Löding
    @Georg.Löding 4 месяца назад

    I really like his explainations! 10 of 10 again. Thank you!

  • @Miloudmiloud-z1m
    @Miloudmiloud-z1m 5 месяцев назад +3

    لغة الرياضيات لغة عالمية موحدة كقانون كرة القدم حقيقة ما اجمل الرياضيات مع الوضعيات المعقدة التي تبحر بك في اعماق التفكير لحلها كنت محبا لهذه المادة والحمد لله افادتني في الحياة

    • @user-jj1sy3yh3v
      @user-jj1sy3yh3v 4 месяца назад

      اكره مااكره الرياضيات وبسبب الرياضيات لم اصل لاهدافي وطموحي بالتعليم حسبي الله ونعم الوكيل

    • @Sci-Marvels
      @Sci-Marvels 4 месяца назад

      تماماً! لغة الرياضيات لغة عالمية توحدنا جميعاً، مثل قوانين كرة القدم. إنها تأخذنا في رحلة عميقة من التفكير لحل التحديات المعقدة. سعيد أن هذه المادة أفادتك في حياتك. الرياضيات حقاً رائعة! 😊📊

  • @zineelabidinebouhaous9326
    @zineelabidinebouhaous9326 4 месяца назад

    حين كنا ندرس في الثانوي لا يمكن الانطلاق الا بمجموعة تعريف اي استثناء أن يكون x#3 ضرورية قبل الانطلاق

  • @peterbyrne6394
    @peterbyrne6394 7 месяцев назад +1

    Thank you. very nice solved equation.

  • @RejepOrazmetow
    @RejepOrazmetow 6 месяцев назад +14

    Как прекрасен язык математики. Всё понятно, подробно объясняно. Учитель супер. Спасибо за ролик.

  • @martinreichard3243
    @martinreichard3243 7 месяцев назад +2

    I prefer to take the square root first and then expand with x-3. This is faster.

  • @nanakojo3711
    @nanakojo3711 Месяц назад

    X x X + (3x3xXxX)
    - - - - - - - - - = 16
    (XxX-3x3)
    > the Xs and 3s in the bracket crosses out.
    X x X = 16
    X squared = 16
    Now, remove the squared from the X, but to do that you have to put 16 in square root sign
    X = square root of 16
    X = 4.

  • @brightonshamale9083
    @brightonshamale9083 15 дней назад

    In fact I wonder how in this life am I going to use all this effort to solve my problems 🤷🏿‍♂️😂😂😂

  • @Aristotlearinzetv
    @Aristotlearinzetv 4 месяца назад

    Binomial triangle can solve the equation in just few lines . You like extra sheet

  • @oxfordmathseries
    @oxfordmathseries 7 месяцев назад +54

    I prefer to get rid of fraction first, then solution will be of 2 minutes only

    • @Ron_DeForest
      @Ron_DeForest 7 месяцев назад +9

      Would have been way faster and easier. So much less time to multiply through then gather terms.

    • @agustinamariarivarolaberra3013
      @agustinamariarivarolaberra3013 5 месяцев назад

      Yes,I agree

    • @jirah5397
      @jirah5397 5 месяцев назад +1

      C'est tres long ca se fait dans 3ou4 ligne . Tu n as qu'à la donné à un Marocain

    • @user-iz1wq7ou3r
      @user-iz1wq7ou3r 5 месяцев назад

      Или българин​@@jirah5397

    • @AmiroVarinda
      @AmiroVarinda 4 месяца назад

      😂❤​@@Ron_DeForest

  • @خالد-ح9ف-د2ل
    @خالد-ح9ف-د2ل 5 месяцев назад +1

    The solution become.complicated,rather than simplfied😮‬‏

  • @FelekeAsefa-p6y
    @FelekeAsefa-p6y 6 месяцев назад

    The correct answer is: $x = 0$
    Explanation: In the previous responses, we found that the equation $x^{2}+(\frac {3x}{x-3})^{2}=16$ has only one solution, which is $x = 0$. This is because when we substitute $x = 0$ into the equation, both terms on the left-hand side become zero, resulting in the equation being satisfied. Therefore, $x = 0$ is the only value of x that satisfies the equation $x^{2}+(\frac {3x}{x-3})^{2}=16$.

  • @dhfdd2939
    @dhfdd2939 8 дней назад

    what about if you can make both side in square root and find the value of x=12 andx=4

  • @ポン吉ポン田
    @ポン吉ポン田 7 месяцев назад

    It can be solved by converting x to a trigonometric function.
    (x/4)^2 + (3x/(4(x-3)))^2 = 1
    x/4 = cos
    3x/(4(x-3)) = sin
    16(cs)^2 - 18cs - 9 = 0

  • @esauogutu1702
    @esauogutu1702 6 месяцев назад

    The secret to solving the equation is formulating it into a product of two quadratic expressions that gives zero

  • @TapanDas-ei3lw
    @TapanDas-ei3lw 7 месяцев назад

    Never ending marathon mathematics and brain 🧠 puzzled stories ever. Einstein newton and all superb mathematicians brain to be needed to understood not like me the stupid one..not getting any sweet juice extract from your mathematics, all energies i have lost to get it understood sir .really sir you've the genius brain and you're great.❤❤❤after this life i shall pray to God ,make me genius like you.❤❤❤❤❤

  • @bernayarimoglu5311
    @bernayarimoglu5311 4 месяца назад

    In Turkiye, in university enterance examinations, you have only 1 or 2 minutes to solve this

  • @chimumaziku3186
    @chimumaziku3186 5 месяцев назад +2

    Yeeeeee my brain already bursted🤣🤣🤣

  • @IsackMboya-e2l
    @IsackMboya-e2l 19 дней назад

    I need to learn more from him

  • @YaoCaeuArmelKOUADIO
    @YaoCaeuArmelKOUADIO 5 месяцев назад

    You forget the square on i for the first solution 😅

  • @josephissara3599
    @josephissara3599 5 месяцев назад

    So the underroot of negative one is i, how about the underroot of another negative number?

  • @HermanGATETE-nm5zj
    @HermanGATETE-nm5zj 3 месяца назад

    All these hours, just only to find X 😂

  • @camairenentertainment254
    @camairenentertainment254 5 месяцев назад

    No wonder I was failing maths
    Did the teacher seriously expect me to memorise all this 😳

  • @danielo.m.288
    @danielo.m.288 4 месяца назад +1

    Hope this can be useful in real life

    • @Goma7489
      @Goma7489 4 месяца назад

      😂😂😂

  • @michaelhuppertz6738
    @michaelhuppertz6738 7 месяцев назад +11

    Nice solution specially how got the (x-3) out of 6x^3+18x^2, neat trick.

  • @劉河順-n7k
    @劉河順-n7k 7 месяцев назад +6

    It's a troubled solution.

  • @dewanfamuji5731
    @dewanfamuji5731 5 месяцев назад

    You missed that x not allowed 3

  • @souzasilva5471
    @souzasilva5471 3 месяца назад

    Não acredito que o melhor professor do mundo tenha uma visão de primeira, para saber que o caminho é este aplicado nesta questão.(I don't believe that the best teacher in the world has the first-class vision to know which way is applied to this issue.)

  • @orlenabright3369
    @orlenabright3369 14 дней назад

    Bro just overcomplicated the whole thing🤦🏾‍♀️

  • @edemkoffiaholou9808
    @edemkoffiaholou9808 4 месяца назад

    Pourquoi tu nous dis que racine carré de I est égal encore à i? Ça n'a pas de sens. Il y a un problème avec le résultat à la fin

  • @michaeltindan
    @michaeltindan 3 месяца назад

    Why this long method?

  • @TewabechEshete-pi3fz
    @TewabechEshete-pi3fz 5 месяцев назад

    too long solution that's why many of us ignored Maths . From your side, excellent potential !

  • @WilnesMondesir-sk7hh
    @WilnesMondesir-sk7hh 9 дней назад +1

    Thanks for the vidéo .

  • @despoinavavoula2203
    @despoinavavoula2203 5 месяцев назад +2

    This is crazy!

  • @PrudentVictor-q6d
    @PrudentVictor-q6d 4 месяца назад

    Good evening ma. Pls i need help in advance level math and physics pls.

  • @yanssala2214
    @yanssala2214 5 месяцев назад

    Parece equivalente a un polinomio de 4to grado, entonces habrian cuatro posibles valores de x
    X^4 -2X^3-6X^2+32X -16=0 es equivalente al problema propuesto.
    Un valor real obtenido por metodos iterativos seria 0,56895 con error no superior a. 0, 0006 😂😂😂

  • @MartinChawana
    @MartinChawana 2 дня назад

    How many marks om this question

  • @sophyodago5062
    @sophyodago5062 3 месяца назад

    Where is 6× from

  • @gelanaadugna7808
    @gelanaadugna7808 4 месяца назад

    I am great sorry to you! why do you take 16 minute for 1 question? Why you make it coplex?

  • @mintusaren895
    @mintusaren895 5 месяцев назад

    Why al zebra unknown vs unknown.

  • @ASKstrive
    @ASKstrive 3 месяца назад

    That is also how learning german will treat you as bigginer.

  • @RoluahpuiaColney
    @RoluahpuiaColney 29 дней назад

    This is a real mathemetics😮😮

  • @lidzusakayina6842
    @lidzusakayina6842 6 месяцев назад +1

    How did you know😮

  • @romelitobragas9279
    @romelitobragas9279 4 месяца назад

    Long methods of solution.
    What about short method sir?

  • @bedelludesta5508
    @bedelludesta5508 4 месяца назад

    I don’t understand it. First you need to explain what are 2 and x represent

  • @wangguochaoTL
    @wangguochaoTL 4 месяца назад

    前面都看懂了,后面根号里公式不记得了,为什么-1开根号变成i😅

  • @nanakojo3711
    @nanakojo3711 Месяц назад +1

    Its totally wrong. X =4

  • @mahmoudibra5822
    @mahmoudibra5822 7 месяцев назад

    Beautiful

  • @user-io7ul8em1o
    @user-io7ul8em1o 2 месяца назад

    We need to know the value of x

  • @IsackMboya-e2l
    @IsackMboya-e2l 19 дней назад

    I like his solutions

  • @gatabaziemmanuel
    @gatabaziemmanuel 6 месяцев назад

    Excellent

  • @mbuyaelyaoni6266
    @mbuyaelyaoni6266 5 месяцев назад

    Mmh, till tomorrow 😅😅

  • @ahadjonxamidov8940
    @ahadjonxamidov8940 7 месяцев назад

    Zo‘r

  • @louiskah4753
    @louiskah4753 6 месяцев назад

    C'est une identité remarquable ❤

  • @jahangirkhan1739
    @jahangirkhan1739 5 месяцев назад

    Why does algebra have such complications and confusing sequence to solve the problem?😂😂

  • @user-io7ul8em1o
    @user-io7ul8em1o 2 месяца назад

    This is so long
    You could finish this after 3 or 4 lines

  • @hope9203
    @hope9203 6 месяцев назад

    Very nice ✅

  • @ЗемфираШаргазина
    @ЗемфираШаргазина 7 месяцев назад

    Почему в ответе Вы сократили на 2..????
    Так нельзя!!!

  • @samsonhailu5133
    @samsonhailu5133 29 дней назад

    Waw 👍👍👍👍

  • @LANNGUYEN-kv6jl
    @LANNGUYEN-kv6jl 4 месяца назад

    The ưay you solve this equation sis SO LONG.

  • @samswift4921
    @samswift4921 7 месяцев назад

    C 1.4 hrs or 84 minutes.

  • @ahmedder3608
    @ahmedder3608 3 месяца назад

    Solution lente

  • @FathimaHararyy
    @FathimaHararyy 2 месяца назад

    Thank you so much 😂😂😂😂😂😂😂😂

  • @joachimkaran6687
    @joachimkaran6687 6 месяцев назад

    Amna kitu umetupereka op

  • @serifahmetgumus5763
    @serifahmetgumus5763 3 месяца назад +1

    Kafa ütülemek matematiği hiç sevmem

  • @Dino-Kukolj
    @Dino-Kukolj 5 месяцев назад

    Too long explanation and you should have switched to the quadratic equasion earlier, it was inevitable and as far as I know there is no negative square root, because any negative number squared gives a positive number, and a positive number squared is anyway positive

  • @JuanCarlosMontoya-z2k
    @JuanCarlosMontoya-z2k 6 месяцев назад

    Para que sirve eso, si no sabe para que es

  • @NadiehFan
    @NadiehFan 7 месяцев назад +3

    Yet another method is to note that (x − 3)² = x² − 6x + 9 and therefore x² = (x − 3)² + 6x − 9 so we can rewrite the equation
    x² + (3x/(x − 3))² = 16
    as
    (x − 3)² + 6x − 9 + (3x/(x − 3))² = 16
    or
    (x − 3)² + 6x + (3x/(x − 3))² − 25 = 0
    Here (x − 3)² + 6x + (3x/(x − 3))² is a perfect square because 6x is twice the product of (x − 3) and 3x/(x − 3) and we also have 25 = 5² so we get
    ((x − 3) + 3x/(x − 3))² − 5² = 0
    which gives us a difference of two squares at the left hand side whereas the right hand side is zero. This allows us to factor the left hand side using the difference of two squares identity and then apply the zero product property. However, before doing so we first multiply both sides by (x − 3)² to eliminate the fraction so we get
    ((x − 3)² + 3x)² − (5(x − 3))² = 0
    (x² − 3x + 9)² − (5x − 15)² = 0
    (x² + 2x − 6)(x² − 8x + 24) = 0
    x = −1 + √7 ⋁ x = −1 − √7 ⋁ x = 4 + 2i√2 ⋁ x = 4 − 2i√2

  • @spelleg11
    @spelleg11 7 месяцев назад

    Great.

  • @MinhTran-xy7hy
    @MinhTran-xy7hy 4 месяца назад

    X2( x3)2=16X yes and nos
    (x-3). =^ ./.

  • @ВасильГецко-з7ш
    @ВасильГецко-з7ш 4 месяца назад

    ТА ЧТО ЗДЕСЬ РИШАТЬ,ЛИХКО И ПРОСТО ,КАК НА ГОРШКЕ ПОСИДЕТЬ🪺

  • @welldonerufu4865
    @welldonerufu4865 21 день назад

    I am confused. .but thanks

  • @SaraAlam-l9t
    @SaraAlam-l9t 4 месяца назад

    It's so simple

  • @rajanisarmah6307
    @rajanisarmah6307 7 месяцев назад

    Aare vaai itni si sota math aur kitna lomba korega??

  • @olympiadeduworks
    @olympiadeduworks 4 месяца назад

    great

  • @AVELINETOMEKA
    @AVELINETOMEKA 5 месяцев назад

    Make people understand 😅😅😅😅😅😅😅😅😅

  • @АЛЕКСАНДРВАН-о9ч
    @АЛЕКСАНДРВАН-о9ч 5 месяцев назад

    Ой, раздули из простого решения целое математическое расследование

  • @jummyshaki2922
    @jummyshaki2922 5 месяцев назад

    So long a letter

  • @ahmadikininga239
    @ahmadikininga239 5 месяцев назад

    Please give a sense to those x and numbers. Be realistic. Don't speak in signs. Unless you are hiding something.

  • @michaeltindan
    @michaeltindan 3 месяца назад

    The method you're using is unnecessarily tooooo loooong. This is a simple question that requires a simple method.

  • @gatabaziemmanuel
    @gatabaziemmanuel 6 месяцев назад

    Good

  • @fentelove9392
    @fentelove9392 4 месяца назад

    This shows us how long, hard and tiresome it is to come up with a constitution..Dont blame your government too much😅

  • @SijinaV-m9q
    @SijinaV-m9q 12 дней назад

    3+√23

  • @alexpangani1944
    @alexpangani1944 6 месяцев назад

    Nice

  • @mintusaren895
    @mintusaren895 5 месяцев назад

    Result same

  • @TheTeller2012
    @TheTeller2012 7 месяцев назад

    X-x/3-1=0

  • @williamvasquezvasquez9878
    @williamvasquezvasquez9878 4 месяца назад

    My brain just turned to mush after watching this🫠

  • @catdoan9281
    @catdoan9281 4 месяца назад

    Clumsy solution. You try to over complicate the solution.

  • @DibweKalambay-cu6ts
    @DibweKalambay-cu6ts Месяц назад

    I find
    X=4

  • @pierreforestier9916
    @pierreforestier9916 6 месяцев назад

    Faluche its wrong

  • @olympiadeduworks
    @olympiadeduworks 4 месяца назад

    nice

  • @ZoukalneLeonLaboulbe
    @ZoukalneLeonLaboulbe 4 месяца назад

    Très longue comme méthode

  • @BaDin-cx9ws
    @BaDin-cx9ws 5 месяцев назад

    Too long way method.

  • @armandoolpindo-b3q
    @armandoolpindo-b3q 6 месяцев назад

    mali yong sulution, Pinaha ba mali naman