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

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    (Original post by Briz97)
    did anyone get 7/4 for 7b?
    i got that, but i dont know if is right
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    (Original post by Skindein)
    i got that, but i dont know if is right
    7b was the implicit differentiation one, right ^^?

    If so, the answer that's been agreed upon is 11/8.
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    (Original post by meerkat96)
    My go at answers
    thanks - these are what I got too.
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    (Original post by datpr0)
    7b was the implicit differentiation one, right ^^?

    If so, the answer that's been agreed upon is 11/8.
    yep, i got 7/4 i am wrong
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    (Original post by Skindein)
    i got that, but i dont know if is right
    i got 7/4 as well, mutsve made stupid mistake
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    Can someone have a look at the updated first post and spot any mistakes?


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    (Original post by Kennethm)
    for 2)b)ii) I got

    -1.19, they ask you for the MAXIMUM value from √29cos(x+1.19) which will be √29

    Therefore √29cos(x+1.19) = √29

    cos(x+1.19) = 1
    x + 1.19 = 0
    x = -1.19

    So why is it 5.09 where as it could be both...
    because the range was 0<x<2pi
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    (Original post by Skindein)
    i got that, but i dont know if is right
    i got that
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    grade boundary predictions?
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    (Original post by HennersPD)
    Do you remember the actual diff equation they asked you to solve?
    Added it to the MS in the first post!


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    On a slightly related note how harsh are examiners if you forget to mark the question reference but your work/answer is clearly for that question?

    I'm pretty sure I didn't make that mistake but at the same time I always have a nagging feeling maybe I did in one of my exams.
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    (Original post by Kennethm)
    grade boundary predictions?
    I find it really hard to predict C4 grade boundaries so not too sure! Think I got 65/75 :/


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    (Original post by datpr0)
    (let theta equal the acute angle)

    Therefore, it came from cos(theta) = 14/28
    => cos(theta) = 1/2
    => theta = 60 degrees
    i got -10/root56 root14 from doing a.b=mod a mod b costheta
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    (Original post by datpr0)
    He's trolling, ignore him.
    I did the back up paper LOL
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    (Original post by CD223)
    Can someone have a look at the updated first post and spot any mistakes?


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    1. the marks for 1b were 6 not 5,
    2. the differential equation solution was x = 1/5[(-1/2(1+t)^-1 + 5/2)^2 - 4],
    3. the constant in the penultimate question was a not k, as stated in the question.
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    remove (OR 5.72???) from Q2 and we should be fine. Not sure about the vectors Part C or 8 part B though.

    Also 8 part A is misleading.
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    (Original post by jamal_m96)
    I did the back up paper LOL
    Go away. You're literally not funny at all :/


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    It seems we have agreed on all answers now except 2bii) what were the answers sure it asked for Root29cos(x + 1.19) =-1???

    I got 0.57 and 3.33
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    Mine is pretty similar, (11, 2, 0) and (23, 6, -8). I probably have made a mistake with the y coordinate.

    (Original post by Jed-Singh)
    question 2 needs sorting and for vectors I swear it was E(11,0,0) and E(23,4,-8)
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    How many marks do you think an A will be?


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