Can you Solve Cambridge University Admission Test ?✍️🖋️📘💙

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  • เผยแพร่เมื่อ 4 ม.ค. 2025
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ความคิดเห็น • 12

  • @chrisgeorgiou8680
    @chrisgeorgiou8680 2 วันที่ผ่านมา +2

    Quite complicated solution. It can be simplified using the formula
    (a+b)²=a²+2ab+b², for both parts of the equation:
    - Add 9/4 to both parts of the equation.
    - The left one becomes (x+3/2)².
    - The right one becomes:
    10000099998 + 9/4 =
    10000000000 + 100000 + 1/4 =
    100000² + 2•100000•½ + ½²=
    (100000 + ½)²,
    So x+3/2=±(100000+½),
    and x=99999, -100002

  • @紫瞳-w6t
    @紫瞳-w6t วันที่ผ่านมา +1

    0. Since the calculator is not allowed, there must be at least 1 way that can extremely simplify the question.
    1.x^2 + 3x = x(x+3) = (x+1)(x+2)-2, let u=x+1
    2. u(u+1) = 10000099998+2 = 10000100000 = 100000(100000+1), u=100000 is one of root,
    3. -( root1 + root2) = coefficient of "u" = 1, u= 100000, -100001
    4. x = u-1 = 99999, -100002

    • @紫瞳-w6t
      @紫瞳-w6t วันที่ผ่านมา +1

      Based on the concept of step 0, 10000099998 is ugly.
      We should do something to make 10000099998 +2.
      That is the reason I chose this solution.

  • @raghvendrasingh1289
    @raghvendrasingh1289 2 วันที่ผ่านมา +1

    👍
    x^2+3x = (10^5)^2+99999 - 1
    x^2+3x = (y+1)^2+y - 1 , where y = 99999
    x^2+3 x = y^2+3 y
    (x - y)(x+y+3) = 0
    x = y , - y - 3
    x = 99999 , - 100002

    • @cigmorfil4101
      @cigmorfil4101 23 ชั่วโมงที่ผ่านมา

      Precisely, why split the 99999 into 9×11111 and have to worry about the coefficient when y=11111?
      Simpler calculations reduce risk of errors.

  • @user-us4pk1oc2b
    @user-us4pk1oc2b 2 วันที่ผ่านมา

    Que lentitud

  • @TheNizzer
    @TheNizzer 2 วันที่ผ่านมา

    You’ll never see a question like this on a Cambridge entrance paper.
    Way, way too easy.

  • @md.mominshahriar
    @md.mominshahriar 2 วันที่ผ่านมา +1

    What was the point of taking 99999=9y?

    • @cigmorfil4101
      @cigmorfil4101 23 ชั่วโมงที่ผ่านมา

      I agree, why split 99999 = 9×11111, and then let y = 11111 to require processing 9y, which is then processed by fully (9y)^2 = 81y^2 which is the factorised to (9y)^2, and the final solution is requires 9y?
      Why not let y = 99999 and use that, simplifying the calculations and reducing the risk of errors?

    • @md.mominshahriar
      @md.mominshahriar 4 ชั่วโมงที่ผ่านมา

      @cigmorfil4101 I think these people are more interested in making longer videos than teaching