Germany | A Nice Math Olympiad Algebra Problem

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  • Опубликовано: 24 ноя 2024

Комментарии • 167

  • @DanielDimov358
    @DanielDimov358 4 месяца назад +11

    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.

  • @miloudchoukri9283
    @miloudchoukri9283 4 месяца 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 2 месяца назад

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

    • @Sci-Marvels
      @Sci-Marvels 2 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! 😊📊

  • @RejepOrazmetow
    @RejepOrazmetow 5 месяцев назад +14

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

  • @jahangirkhan1739
    @jahangirkhan1739 3 месяца назад +9

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

    • @annoint3d2mvu
      @annoint3d2mvu 2 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 Месяц назад

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

  • @OlajiireTaiwo
    @OlajiireTaiwo 2 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 2 месяца назад

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

  • @NadiehFan
    @NadiehFan 6 месяцев назад +12

    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 6 месяцев назад

      I would have done same 👍🏻

    • @TapanDas-ei3lw
      @TapanDas-ei3lw 5 месяцев назад

      You're also a great genius ❤❤❤

    • @anjalidilipogale4208
      @anjalidilipogale4208 4 месяца назад

      More simpler

    • @DanielDimov358
      @DanielDimov358 4 месяца назад

      Where does line №4 come from?

    • @NadiehFan
      @NadiehFan 4 месяца 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

  • @zineelabidinebouhaous9326
    @zineelabidinebouhaous9326 3 месяца назад

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

  • @michellewelchman9245
    @michellewelchman9245 6 месяцев назад +6

    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.

  • @ajmiller7102
    @ajmiller7102 6 месяцев назад +5

    Excellent. Straight to the solutions. Well done!

  • @martinreichard3243
    @martinreichard3243 6 месяцев назад +2

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

  • @خالد-ح9ف-د2ل
    @خالد-ح9ف-د2ل 4 месяца назад +1

    The solution become.complicated,rather than simplfied😮‬‏

  • @michaelhuppertz6738
    @michaelhuppertz6738 6 месяцев назад +11

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

  • @oxfordmathseries
    @oxfordmathseries 6 месяцев назад +49

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

    • @Ron_DeForest
      @Ron_DeForest 6 месяцев назад +8

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

    • @agustinamariarivarolaberra3013
      @agustinamariarivarolaberra3013 3 месяца назад

      Yes,I agree

    • @jirah5397
      @jirah5397 3 месяца 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 3 месяца назад

      Или българин​@@jirah5397

    • @AmiroVarinda
      @AmiroVarinda 3 месяца назад

      😂❤​@@Ron_DeForest

  • @despoinavavoula2203
    @despoinavavoula2203 3 месяца назад +2

    This is crazy!

  • @chimumaziku3186
    @chimumaziku3186 3 месяца назад +2

    Yeeeeee my brain already bursted🤣🤣🤣

  • @HermanGATETE-nm5zj
    @HermanGATETE-nm5zj Месяц назад

    All these hours, just only to find X 😂

  • @nanakojo3711
    @nanakojo3711 3 дня 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.

  • @peterbyrne6394
    @peterbyrne6394 5 месяцев назад +1

    Thank you. very nice solved equation.

  • @ポン吉ポン田
    @ポン吉ポン田 6 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

  • @TapanDas-ei3lw
    @TapanDas-ei3lw 5 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.❤❤❤❤❤

  • @Aristotlearinzetv
    @Aristotlearinzetv 2 месяца назад

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

  • @bernayarimoglu5311
    @bernayarimoglu5311 2 месяца назад

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

  • @FelekeAsefa-p6y
    @FelekeAsefa-p6y 4 месяца 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 $x^{2}+(\frac {3x}{x-3})^{2}=16$.

  • @YaoCaeuArmelKOUADIO
    @YaoCaeuArmelKOUADIO 3 месяца назад

    You forget the square on i for the first solution 😅

  • @danielo.m.288
    @danielo.m.288 2 месяца назад +1

    Hope this can be useful in real life

  • @louiskah4753
    @louiskah4753 5 месяцев назад

    C'est une identité remarquable ❤

  • @camairenentertainment254
    @camairenentertainment254 3 месяца назад

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

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

    It's a troubled solution.

  • @esauogutu1702
    @esauogutu1702 4 месяца назад

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

  • @gatabaziemmanuel
    @gatabaziemmanuel 4 месяца назад

    Excellent

  • @dewanfamuji5731
    @dewanfamuji5731 3 месяца назад

    You missed that x not allowed 3

  • @mbuyaelyaoni6266
    @mbuyaelyaoni6266 3 месяца назад

    Mmh, till tomorrow 😅😅

  • @TewabechEshete-pi3fz
    @TewabechEshete-pi3fz 4 месяца назад

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

  • @souzasilva5471
    @souzasilva5471 Месяц 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.)

  • @josephissara3599
    @josephissara3599 4 месяца назад

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

  • @yanssala2214
    @yanssala2214 4 месяца 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 😂😂😂

  • @mahmoudibra5822
    @mahmoudibra5822 5 месяцев назад

    Beautiful

  • @spelleg11
    @spelleg11 6 месяцев назад

    Great.

  • @hope9203
    @hope9203 4 месяца назад

    Very nice ✅

  • @LANNGUYEN-kv6jl
    @LANNGUYEN-kv6jl 3 месяца назад

    The ưay you solve this equation sis SO LONG.

  • @ASKstrive
    @ASKstrive 2 месяца назад

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

  • @lidzusakayina6842
    @lidzusakayina6842 4 месяца назад +1

    How did you know😮

  • @joachimkaran6687
    @joachimkaran6687 4 месяца назад

    Amna kitu umetupereka op

  • @ahadjonxamidov8940
    @ahadjonxamidov8940 6 месяцев назад

    Zo‘r

  • @mintusaren895
    @mintusaren895 3 месяца назад

    Why al zebra unknown vs unknown.

  • @olympiadeduworks
    @olympiadeduworks 3 месяца назад

    great

  • @PrudentVictor-q6d
    @PrudentVictor-q6d 2 месяца назад

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

  • @serifahmetgumus5763
    @serifahmetgumus5763 2 месяца назад +1

    Kafa ütülemek matematiği hiç sevmem

  • @samswift4921
    @samswift4921 6 месяцев назад

    C 1.4 hrs or 84 minutes.

  • @michaeltindan
    @michaeltindan Месяц назад

    Why this long method?

  • @ВасильГецко-з7ш
    @ВасильГецко-з7ш 3 месяца назад

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

  • @user-io7ul8em1o
    @user-io7ul8em1o Месяц назад

    We need to know the value of x

  • @mohamedsalah5525
    @mohamedsalah5525 6 месяцев назад

    4-

  • @sophyodago5062
    @sophyodago5062 Месяц назад

    Where is 6× from

  • @jahangirkhan1739
    @jahangirkhan1739 3 месяца назад

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

  • @FathimaHararyy
    @FathimaHararyy Месяц назад

    Thank you so much 😂😂😂😂😂😂😂😂

  • @SaraAlam-l9t
    @SaraAlam-l9t 2 месяца назад

    It's so simple

  • @NadiehFan
    @NadiehFan 6 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

  • @edemkoffiaholou9808
    @edemkoffiaholou9808 2 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

  • @gatabaziemmanuel
    @gatabaziemmanuel 4 месяца назад

    Good

  • @ednalee3083
    @ednalee3083 3 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😅

  • @alexpangani1944
    @alexpangani1944 4 месяца назад

    Nice

  • @olympiadeduworks
    @olympiadeduworks 3 месяца назад

    nice

  • @gelanaadugna7808
    @gelanaadugna7808 2 месяца назад

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

  • @ahmedder3608
    @ahmedder3608 2 месяца назад

    Solution lente

  • @InkoNu-nv9tf
    @InkoNu-nv9tf 23 дня назад

    =2

  • @francescobonacorsi5778
    @francescobonacorsi5778 4 месяца назад

    Impressionante

  • @user-io7ul8em1o
    @user-io7ul8em1o Месяц назад

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

  • @MinhTran-xy7hy
    @MinhTran-xy7hy 3 месяца назад

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

  • @AVELINETOMEKA
    @AVELINETOMEKA 4 месяца назад

    Make people understand 😅😅😅😅😅😅😅😅😅

  • @АЛЕКСАНДРВАН-о9ч
    @АЛЕКСАНДРВАН-о9ч 4 месяца назад

    Ой, раздули из простого решения целое математическое расследование

  • @joachimkaran6687
    @joachimkaran6687 4 месяца назад

    Umekosea APO

  • @JuanCarlosMontoya-z2k
    @JuanCarlosMontoya-z2k 5 месяцев назад

    Para que sirve eso, si no sabe para que es

  • @jummyshaki2922
    @jummyshaki2922 4 месяца назад

    So long a letter

  • @FatimaFatima-eu7ix
    @FatimaFatima-eu7ix 2 месяца назад

    Mamma mia 😢

  • @mohammadwatan1992
    @mohammadwatan1992 Месяц назад

    👍

  • @williamvasquezvasquez9878
    @williamvasquezvasquez9878 2 месяца назад

    My brain just turned to mush after watching this🫠

  • @bedelludesta5508
    @bedelludesta5508 2 месяца назад

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

  • @mintusaren895
    @mintusaren895 3 месяца назад

    Result same

  • @DimosoAbduly
    @DimosoAbduly 4 месяца назад

    4

  • @romelitobragas9279
    @romelitobragas9279 3 месяца назад

    Long methods of solution.
    What about short method sir?

  • @BambadjiFall
    @BambadjiFall 4 месяца назад

    ❤❤❤❤❤❤❤❤❤❤

  • @user-io7ul8em1o
    @user-io7ul8em1o Месяц назад

    Long way

  • @ЗемфираШаргазина
    @ЗемфираШаргазина 5 месяцев назад

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

  • @TheTeller2012
    @TheTeller2012 5 месяцев назад

    X-x/3-1=0

  • @lenchorivera8543
    @lenchorivera8543 5 месяцев назад

    Me estoy acordando de mis clases en la prepa…

  • @tatyanasnisarenko1627
    @tatyanasnisarenko1627 5 месяцев назад

    Х=2

  • @tamarshahverdyan2723
    @tamarshahverdyan2723 5 месяцев назад

    # 30 #

  • @gandhingira4071
    @gandhingira4071 2 месяца назад

    Jesus!

  • @SakeerHussain-gu4sm
    @SakeerHussain-gu4sm 4 месяца назад

    10

  • @rajanisarmah6307
    @rajanisarmah6307 5 месяцев назад

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

  • @nanakojo3711
    @nanakojo3711 3 дня назад

    Its totally wrong. X =4

  • @ZoukalneLeonLaboulbe
    @ZoukalneLeonLaboulbe 3 месяца назад

    Très longue comme méthode

  • @fentlove9392
    @fentlove9392 2 месяца назад

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

  • @armandoolpindo-b3q
    @armandoolpindo-b3q 4 месяца назад

    mali yong sulution, Pinaha ba mali naman

  • @aminovskyaaminov5426
    @aminovskyaaminov5426 2 месяца назад

    Trop long et trop compliqué

  • @antokrys6344
    @antokrys6344 4 месяца назад

    Too long way and time

  • @bandoubenamar2802
    @bandoubenamar2802 5 месяцев назад

    I no 😂

  • @pierreforestier9916
    @pierreforestier9916 4 месяца назад

    Faluche its wrong