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Thread: BoS Maths Trials 2017

  1. #76
    -insert title here- Paradoxica's Avatar
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    Re: BoS Maths Trials 2017

    aye lmao apparently people think



    rip there goes ur marks

    also

    a lot of people forgot that √k = 1-√h

    their area function was (1-√h)² instead of (1-√h)⁴

    there goes another mark

    bless u janzen choi for being the one person who got my spiky volume correct <3

    another kid almost got the answer correct but they forgot to double the result bc they were only finding the upper half volume...

    rip in pieces

    also a lot of u stoners thought the curved edges were like a square minus a circle????

    can u even graphs plz
    Last edited by Paradoxica; 17 Oct 2017 at 2:26 PM.
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    If I am a conic section, then my e = ∞

    Just so we don't have this discussion in the future, my definition of the natural numbers includes 0.

  2. #77
    -insert title here- Paradoxica's Avatar
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    Re: BoS Maths Trials 2017



    that's not even close
    Last edited by Paradoxica; 17 Oct 2017 at 2:34 PM.
    If I am a conic section, then my e = ∞

    Just so we don't have this discussion in the future, my definition of the natural numbers includes 0.

  3. #78
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    Re: BoS Maths Trials 2017

    Got the solution when I got home
    Last edited by apinix; 18 Oct 2017 at 1:15 AM.

  4. #79
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    Re: BoS Maths Trials 2017

    when will solutions be up??

  5. #80
    Administrator Trebla's Avatar
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    Re: BoS Maths Trials 2017

    Before the respective HSC exam

    Though feel free to request hints/short solutions to any particular question you want an answer for now

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    Re: BoS Maths Trials 2017

    Quote Originally Posted by Trebla View Post
    Before the respective HSC exam

    Though feel free to request hints/short solutions to any particular question you want an answer for now
    For the Q11 (c)(i) vectors question, after using the triangular inequality, how do you come to the inequality you're required to prove? I can't seem to work out how to algebra this.

  7. #82
    Administrator Trebla's Avatar
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    Re: BoS Maths Trials 2017

    Quote Originally Posted by SaltSolutionPromo View Post
    For the Q11 (c)(i) vectors question, after using the triangular inequality, how do you come to the inequality you're required to prove? I can't seem to work out how to algebra this.
    Use the triangle inequality on the LHS then expand and simplify

  8. #83
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    Re: BoS Maths Trials 2017

    Quote Originally Posted by SaltSolutionPromo View Post
    For the Q11 (c)(i) vectors question, after using the triangular inequality, how do you come to the inequality you're required to prove? I can't seem to work out how to algebra this.
    Basically the sum of the terms inside the absolute values on the LHS is equal to the expression in the absolute values on the RHS (that is, (a-b)(c-d) + (a-d)(b-c) = (a-c)(b-d)). So the result follows from the triangle inequality (|z| + |w| ≥ |z + w|).

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    Re: BoS Maths Trials 2017

    Just to check, is it too much to ask to see our papers? Only if it's not a hassle, wouldn't mind seeing the places where I screwed up when I shouldn't have

    (I haven't looked at the paper since, decided past HSC papers were a bit more down to earth wew)
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  10. #85
    Junior Member aycaramba's Avatar
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    Re: BoS Maths Trials 2017

    keen for the solutions & results. hope I get at least 5%

  11. #86
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    Re: BoS Maths Trials 2017

    It might be difficult since all the papers were separated question by question for marking in different piles, and there is a lot of pages that needs to be scanned for one person, and given that the organisers are doing it on a voluntary basis and they have full time work (the people who wrote the exams), it is highly unlikely they will have the time to do that... except in exceptional circumstances or by exercise of their personal discretion.

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    Re: BoS Maths Trials 2017

    Quote Originally Posted by strawberrye View Post
    It might be difficult since all the papers were separated question by question for marking in different piles, and there is a lot of pages that needs to be scanned for one person, and given that the organisers are doing it on a voluntary basis and they have full time work (the people who wrote the exams), it is highly unlikely they will have the time to do that... except in exceptional circumstances or by exercise of their personal discretion.
    Ah right, that's okay. Thanks though, I'll keep my eye out for the answers + the final marks then ^^

  13. #88
    -insert title here- Paradoxica's Avatar
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    Re: BoS Maths Trials 2017

    Quote Originally Posted by Raeservoir View Post
    Just to check, is it too much to ask to see our papers? Only if it's not a hassle, wouldn't mind seeing the places where I screwed up when I shouldn't have

    (I haven't looked at the paper since, decided past HSC papers were a bit more down to earth wew)
    I'm looking into this possibility, but the decision ultimately lies with Carrotsticks and Trebla.
    Raeservoir likes this.
    If I am a conic section, then my e = ∞

    Just so we don't have this discussion in the future, my definition of the natural numbers includes 0.

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    Re: BoS Maths Trials 2017

    Quote Originally Posted by strawberrye View Post
    It might be difficult since all the papers were separated question by question for marking in different piles, and there is a lot of pages that needs to be scanned for one person, and given that the organisers are doing it on a voluntary basis and they have full time work (the people who wrote the exams), it is highly unlikely they will have the time to do that... except in exceptional circumstances or by exercise of their personal discretion.
    This. Thank you for explaining, Strawberrye.

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    Re: BoS Maths Trials 2017

    Hey, when will the marks be shown to the forum? If they have already is it possible for a link? Thank you very much!

  16. #91
    Administrator Trebla's Avatar
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    Re: BoS Maths Trials 2017

    Quote Originally Posted by qazzopro View Post
    Hey, when will the marks be shown to the forum? If they have already is it possible for a link? Thank you very much!
    Soon. Give it a couple more hours

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    Re: BoS Maths Trials 2017

    Quote Originally Posted by Trebla View Post
    Soon. Give it a couple more hours
    Does that mean solutions will be out as well?

  18. #93
    -insert title here- Paradoxica's Avatar
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    Re: BoS Maths Trials 2017

    when one person is out of commission for a few hours and everyone stays up late getting solutions together :')

    #sleep4days
    If I am a conic section, then my e = ∞

    Just so we don't have this discussion in the future, my definition of the natural numbers includes 0.

  19. #94
    Administrator Trebla's Avatar
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    Re: BoS Maths Trials 2017

    Boom
    Attached Files Attached Files
    Last edited by Trebla; 22 Oct 2017 at 5:54 PM.

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    Re: BoS Maths Trials 2017

    Quote Originally Posted by shehan123 View Post
    Hey, could someone hint me how to do the first part of the pyramid question in the Extension 1 Paper? Its the only one i still cant get
    Extend OP to hit the triangle QRS at M, then calculate MP in two different ways.
    shehan123 likes this.
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    Mathematics Extension 1, Mathematics Extension 2

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    Re: BoS Maths Trials 2017

    what schools came to the top?
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  22. #97
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    Re: BoS Maths Trials 2017

    Congrats Calamebe with the new record
    2016 Preliminary

    Maths Extension • English Advanced • Biology • Legal Studies • Physics • PDHPE

    2017 HSC

    Maths Extension 2 • English Advanced • Biology • Physics • PDHPE

    Atar aim: 97
    Desired Course: Physiotherapy

  23. #98
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    Re: BoS Maths Trials 2017

    Quote Originally Posted by Paradoxica View Post
    when one person is out of commission for a few hours and everyone stays up late getting solutions together :')

    #sleep4days
    Who was out of commission? I'll ban them.

  24. #99
    I love trials pikachu975's Avatar
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    Re: BoS Maths Trials 2017

    Did better than I thought

    Congrats on the 74 calamebe new record

    8/15 in that q16 is crazy
    calamebe and fluffchuck like this.
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    2017 HSC: // English Adv (91) // Bio (96) // Phys (95) // 3U Maths (99) // 4U Maths (97) //
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  25. #100
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    Re: BoS Maths Trials 2017

    What is the reasoning behind the second line of the estimate for |Q(k*alpha)| in the solution to Q16h) ?

    As written, that does not seem complete to me.

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