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

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    You take a two out of ln25 by expressing it as ln(5^2) = 2ln5 so the 1/6ln25 = 1/3ln5
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    (Original post by CD223)
    I can try and write my answers in the first post but they won't be extensive.
    1) A=3 B=-1
    1b) 8/3ln5

    2)ai r=root 29 alpha=1.19 (3 marks)
    2bi) max value root 29 x=5.09 (2 marks)
    2bii) x=0.568 or 5..72

    3a) d=1 (1 mark)
    3b) (2x+1)(2x-1)(2x-3)
    c) h(x)=(1=2x)^-1 differentiate shows its decreasing (4 marks)

    4a) 1+x-2x^24 (2 marks)
    4aii) 1/4 -x/16+5x^2/256 (3 marks)
    bii) 0.2313

    5a)gradient of normal =-1/2 (1 mark)
    5b) equation of normal y=2x-1/2
    5c) x cooridinate -1/8 ( 5 marks)

    6a) 60 degrees (3 marks)
    6b) (15,3,2) (4 marks)
    6c) (23,3,0) and (11,0,0) (4 marks)

    7a) 1/4-ln2 (1 mark)
    b)11/8 (6 Marks)

    8a) x=9/20-1/2(t+1)-1/20(1+t)^2 (7 marks)
    b)dr/dt=k/pir^2 (3marks)
    c) 3 (2 marks)
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    Reckon I lost 8 marks in the vectors question, but otherwise OK. Didn't finish finding the x coordinate for Q, got sinq= -3/4, 1/2 (Probably wrong). Probably lost a couple of marks on the decreasing function one too as I didn't differentiate.

    Grade boundary predictions:
    A* - 62
    A - 57
    B - 52
    C - 47

    Etc.
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    Does anyone remember the differential equation question
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    The x values in question 2)c) were 0.57 and 3.44
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    (Original post by sum1random)
    for question 2 last part i got 3.34 for second value of x, pls any1 say they got the same :|
    I did i rounded to 3.33 and another solution
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    (Original post by George1231)
    1) A=3 B=-1
    1b) 8/3ln5

    2)ai r=root 29 alpha=1.19
    2bi) max value root 29 x=5.09
    2bii) x=0.568 or 5..72

    3a) d=1
    3b) (2x+1)(2x-1)(2x-3)
    c) h(x)=(1=2x)^-1 differentiate shows its decreasing

    4a) 1+x-2x^2
    4b)i 1/4 -x/16+5x^2/256
    bii) 0.2313

    5a)gradient of normal =-1/2
    5b) equation of normal y=2x-1/2
    5c) x cooridinate -1/8

    6a) 60 degrees (3 marks)
    6b) (15,3,2) (4 marks)
    6c) (23,3,0) and (11,0,0) (4 marks)

    7a) 1/4-ln2 (1 mark)
    b)11/8 (6 Marks)

    8a) x=9/20-1/2(t+1)-1/20(1+t)^2 (7 marks)
    b)dr/dt=k/pir^2 (3marks)
    c) 3 (2 marks)
    Can you put the marks next to all the questions if possile?
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    (Original post by Jed-Singh)
    I got 1/2 and -3/4 for the xcoordinate of p, rejected 1/2 as that was in first part so therefore -3/4?
    Had that exactly! Anyone else?
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    I put (x-1/2) into the h(x) question, still got (2x-3)(2x-1) and cancelled it as far as possible and showed it decreased, but i that (x-1/2) should have been (2x-1) so that didn't cancel. how many marks have I lost?
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    (Original post by ThePanoramicGame)
    I did i rounded to 3.33 and another solution
    I had 0,568 and 3,34 is that correct?
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    Just added a mock MS in the first post with everyone's collective answers - gonna credit and link to the other thread, and also reformat in latex


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    2b and 5c I got different answers for, 3.34 for 2b and -3/4 for 5c
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    (Original post by CD223)
    Just added a mock MS in the first post with everyone's collective answers - gonna credit and link to the other thread, and also reformat in latex


    Posted from TSR Mobile
    Do u remember the differential equation question
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    Ooh that answer for 8a actually does look kinda like what I got. Don't think it's exactly the same tho still.

    The diff eq was something like dx/dt = sqrt(4+5x) / 5(1-t)^2 IIRC.
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    I got 8/11 for gradient :/
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    (Original post by CD223)
    Just added a mock MS in the first post with everyone's collective answers - gonna credit and link to the other thread, and also reformat in latex


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    Relatively sure the differential equation question's answer given there is incorrect.
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    (Original post by Briz97)
    did anyone get 7/4 for 7b?
    Yeah, it's cause we would forgotten to times by y on the -6e^-3x, I did exactly the same
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    (Original post by Jed-Singh)
    2b and 5c I got different answers for, 3.34 for 2b and -3/4 for 5c
    Agree!
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    how much ums would 55 marks get
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    (Original post by George1231)
    yes they asked for x in terms of t. and I'm pretty sure that right as the answer as 0.211 is when you cube root 1/81
    that is so sneaky, atleast i realised you had to put c in for x=0 and y=0 so happy with that part of it yeah your right for your answer because it should be close to the actual cube root of 1/81 stil hoping for lots of method marks for these two questions happy with most of the rest of the paper
 
 
 
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