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AQA A2 Mathematics MPC4 Core 4 - 9th June 2015 [Discussion & unofficial markscheme] Watch

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    (Original post by George1231)
    i dont understand what you have done for the parametric. Did you do (dy/dt)/dx/dt. I assume you get one method mark for differentiating x and on method mark for differentiating y and then one for the answer. For the vector question I'm still unsure if i got it right myself so can't answer. And the last part of the differential question do you mean dr/dt or 7a.
    no wait not parametric the implicit function... is it ok to sub in the x and y and and find dy/dX? (I got 10/11 or 11/10)

    I mean the very last part when you had to find r...

    people got 3 but I got 1/3?
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    Made such a stupid mistake while rushing and put root29 cos(x - 1.19). How many marks will I have lost on question two?
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    (Original post by madmenace)
    no wait not parametric the implicit function... is it ok to sub in the x and y and and find dy/dX? (I got 10/11 or 11/10)

    I mean the very last part when you had to find r...

    people got 3 but I got 1/3?
    1/3 is the answer if you incorrectly set up the differential equation (many people did this)... It will drop you 3 marks over the whole of 8b probably


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    (Original post by CD223)
    Thanks man - I'm still so disappointed in myself
    same man I wrote 3.33 instead of 3.34 on that trig - Just plenty of small mistakes but I'm certain the grade boundaries will agree with us.
    Is there anything big you missed or got wrong?
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    (Original post by madmenace)
    no wait not parametric the implicit function... is it ok to sub in the x and y and and find dy/dX? (I got 10/11 or 11/10)

    I mean the very last part when you had to find r...

    people got 3 but I got 1/3?
    what values did you sub in for x and y. and for the last part do you remember the exact wording of the question as it could be either?
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    (Original post by Northern457)
    Made such a stupid mistake while rushing and put root29 cos(x - 1.19). How many marks will I have lost on question two?
    Depends on your working, probably 3


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    (Original post by CD223)
    Thanks man - I'm still so disappointed in myself
    No worries, I'm sure you've done better than you think! Looking at your Core 3 mark scheme you've probably got 100 UMS on that!
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    (Original post by George1231)
    what values did you sub in for x and y. and for the last part do you remember the exact wording of the question as it could be either?
    No it couldn't, 1/3 was a common mistake though


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    so can anyone confirm answers to question 2? or can anyone work through it because im still unsure what 100% correct answer is?
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    (Original post by HennersPD)
    I got the gradient as 8/11 ://
    All I remember was an 8 and an 11, can't remember which way round though haha. Think I got 11/8 though
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    (Original post by CD223)
    *** OFFICIAL AQA CORE 4 MPC4 JUNE 2015 EXAM DISCUSSION THREAD ***

    UNOFFICIAL MARK SCHEME (Will credit other users shortly as I barely got any of these right lol):

    1
    A) A=3 B=-1 (3 marks)
    B). 8/3ln5 (5 marks)

    2
    A) √29cos(x+1.19) (3 Marks)
    B)
    (i). x=5.09 (2 Marks)
    (ii) x=0.567, 3.34 (3 Marks) (OR 5.72???)

    3.
    A) d=1 (2 Marks)
    B) g(x) = (2x+1)(2x-1)(2x+3) (3 marks)
    C) h(x) = 1/(2x+3), h'(x) = -2(2x+3)^-2 this is always negative, therefore it is a decreasing function (4 Marks)

    4.
    A) 1 + x - 2(x^2) (2 Marks)
    B)
    (i). 1/4 - 1/16x + 5/256x^2 (3 Marks)
    (ii). 0.2313 (2 Marks)

    5.
    A) dy/dx= -1/2 (3 Marks)
    B) y=2x-1/2 (2 Marks)
    C) cos2q = -1/8 (5 Marks)

    6.
    A) Theta = 60 degrees (4 Marks)
    B) C(15, 6, 2) (4 Marks) (OR 15,3,2???)
    C) E(11, 0, 0) and (23, 3, 0) (4 Marks)

    7.
    A) k=1/4 - ln2 (1 Mark)
    B). dy/dx = 11/8 (6 Marks)

    8.
    A). x=9/20-1/2(t+1)-1/20(1+t)^2 (7 marks)
    B)
    (i) dr/dt = k/(pir^2) (3 Marks)
    (ii). r=3 (2 Marks)

    Date: 9th June 2015
    Time: 09:00am
    Duration: 1h 30m
    ______________________________
    CORE 3 EXAM DISCUSSION THREAD:
    http://www.thestudentroom.co.uk/showthread.php?t=3041463

    MECHANICS 2 EXAM DISCUSSION THREAD:
    http://www.thestudentroom.co.uk/showthread.php?t=3047357

    ______________________________

    RESOURCES:
    For 8b)i) isnt it dr/dt= (pi*r^2)/k
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    My go at answers
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    (Original post by Jeff97)
    did no one get 69.1 for the angle where does 60 come from?
    (let theta equal the acute angle)

    Therefore, it came from cos(theta) = 14/28
    => cos(theta) = 1/2
    => theta = 60 degrees
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    I've made so many stupid mistakes on both Core papers, and I even made a few on my Stats paper too. There's no chance that I'll get an A now.
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    (Original post by amyrah)
    coordinates for C were (-9, -2, 18) ?
    I got that as well... I did it like twice and got that... The lamda for line L was -4 wasn't it??? Or 4 don't remember ... But yeah .. Then for the E one f the positions I got was (9,0,0) - don't remember the other one.
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    (Original post by Alexandrite)
    They didn't. I didn't have time to simplify it so I really hope it doesn't cost me a mark. It would be kind of ****ty of them to do that when they didn't mention it but at the same time you are taught to always simplify so I don't know.
    1) Phew!
    2) I agree, although in some examiner reports they've said that if not told to simplify, candidates should avoid doing so in order to avoid unecessary lost marks. However, the answer which everyone has on here looks nothing like mine at all
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    (Original post by ForgottenApple)
    Nah
    says on front 8 moron
    Nah mine said 9 moron
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    (Original post by jamal_m96)
    Nah mine said 9 moron
    Probably your score
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    (Original post by jchap9776)
    Potentially, did anybody else show x tending to infinity = 2x-3 tending to infinity = 1/(2x-3) tends to 0? Therefore is decreasing. (Idk if it was 2x-3 but was something like that)

    Yeah did exactly that
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    (Original post by vicki36)
    You're such a ****, stop scaring that poor person! I wrote part of my answer to question 8 on the very back sheet so there definitely wasn't a question 9.
    Nah love im pretty sure my core 3 exam had a question 9
 
 
 
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