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AQA Core 4 Exam Discussion 14/06/2012 !Poll, paper and unofficial MS (first post)!

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  • View Poll Results: How did you find the exam?
    Pshh I could do it in my sleep!
    14
    5.56%
    Went pretty well
    29
    11.51%
    It was okay... (maybe made silly mistakes?)
    82
    32.54%
    62
    24.60%
    I died.
    61
    24.21%
    Fine I guess, couldn't careless.
    4
    1.59%

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    (Original post by LGrosvenor101)
    And oh... I think I remember speaking to you before, again, cannot remember what about! and yes! Warwick for Chemistry xD Sorry, I cannot remember where you said you were going
    I firmed for Warwick; computer-science .
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    (Original post by mojopin1)
    I can't really remember now but you first had to differentiate the equation, one part of it needed the product rule. Then you make your dy/dx = 0. Bottom lines cancels and you're left with Y=... Sub that back into the original equation and you get a quadratic which you have to factor, then you get +- 1/3. Then sub these back into your Y=... to get the stationary points.
    thatnks for expaining.

    that sounds pretty hard, so i don't think i would of managed all that under exam pressure anyway. I differentiated it correctly, i think but thats where i got stuck
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    (Original post by SomeoneIveNeverMet)
    Was is |x|<4? Because that's what I put but a few have been saying otherwise haha oh well, it was 1 mark. I never really got them either! That's why if that isn't the answer, I haven't a clue how to get to the answer haha.
    Oh I made a silly mistake with the px^2(4-x^2)...on the last line (for some STUPID reason) instead of writing 9/4, I multiplied 9 by 4 and wrote 36 (*facepalm*).
    I know that vector question my heart was pounding! I hate vectors, so so much. And then with all the fractions I really thought it was wrong xD

    I knew it was Warwick! Woooo! Hahaha my memory isn't so bad after all What grades do you need?
    That's okay UCL for Civil Engineering, need A*AA (ouch )
    I don't know, I just never really got them :L and I made that silly mistake too! For some reason I just left it as 9x^2(4-x^2) not sure how many marks I would lose :L

    I was so pleased I understood vectors! I never really got it until a couple of days ago, and I am so glad that I nice vectors question came up! xD and lol I need AAB in Maths and Chemistry, and ouch what do you think you will get at the moment? and how many more exams do you have?
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    Question 3.

    a) (1+4x)^{\dfrac{1}{2}} \approx 1 + 2x - 2x^2

    bi) (4-x)^{\dfrac{-1}{2}} = \dfrac{1}{2} (1-\dfrac{x}{4})^{\dfrac{-1}{2}}

\

\approx \dfrac{1}{2} + \dfrac{x}{16} + \dfrac{3x^2}{256}

    bii) |\dfrac{x}{4}| &lt; 1 \Rightarrow |x|&lt;4

    c) \dfrac{1}{2} + \dfrac{17x}{16} - \dfrac{221x^2}{256}
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    For the range/limits question in bionomial question, was it something like -4<x<4
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    (Original post by f1mad)
    I firmed for Warwick; computer-science .
    Oh cool! What do you need? and have you applied for accommodation yet?
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    love that i messed up on the first question!!

    i only got half of b as i didnt divide my -5 by 2x+1 haha oops!
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    (Original post by greenfro)
    love that i messed up on the first question!!

    i only got half of b as i didnt divide my -5 by 2x+1 haha oops!
    CRAP. Ah jesus christ, I've just realised this. My M2 resit needs to go REALLY well now. Need a B
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    (Original post by Rotravis)
    Where does the 5/2 ln (2x+1) come from? Doesn't the bottom (2x+1) cancel out with the factor on the top, leaving you with 2x^2-x+3?
    yes, you're right
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    (Original post by Oromis263)


    bii) |\dfrac{x}{4}| &lt; 1 \Rightarrow |x|&lt;4
    Again, I'm pretty sure it's x<4. Your answer implies the range of x is -4 < x < 4, yet if you put a number lower than -4 in the function, it still works...


    This was posted from The Student Room's iPhone/iPad App
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    (Original post by SomeoneIveNeverMet)
    yes, you're right
    I think I forgot the -5 remainder.
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    Question 4.

    ai) V = 1000(\dfrac{103}{100})^5 \Rightarrow V = £1160

    aii) 2000 = 1000(\dfrac{103}{100})^N \Rightarrow N = 24 (rounded\ up\ to\ complete\ year)

    b) When V_B = V_W (Then\ round\ up.)

\

(1.03)^T = 1.5(1.015)^T

\

T ln (1.03) = ln1.5(1.015)^T = ln1.5 + Tln(1.015) \Rightarrow T = 27.6,\ round\ up\ to\ 28\ years.
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    after looking through this paper again... maybe I didn't do as bad as I think I did. Still would like grade boundaries as low as last june *PRAYS*
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    (Original post by Cath-ay)
    after looking through this paper again... maybe I didn't do as bad as I think I did. Still would like grade boundaries as low as last june *PRAYS*
    Lets be honest, you got AT LEAST 99UMS


    This was posted from The Student Room's iPhone/iPad App
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    (Original post by LGrosvenor101)
    Oh cool! What do you need? and have you applied for accommodation yet?
    Not yet, got one more exam to go then I will .

    How about you?
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    (Original post by LGrosvenor101)
    I don't know, I just never really got them :L and I made that silly mistake too! For some reason I just left it as 9x^2(4-x^2) not sure how many marks I would lose :L

    I was so pleased I understood vectors! I never really got it until a couple of days ago, and I am so glad that I nice vectors question came up! xD and lol I need AAB in Maths and Chemistry, and ouch what do you think you will get at the moment? and how many more exams do you have?
    Ah look at us making silly mistakes sad times. I'm hoping it's no more than 1 or 2 marks (it was out of 6/7 marks I think, and that mistake was made on the very last line). Haha yeah I'm so so glad it was a nice vector question! Vectors were definitely my biggest worry.

    What other subjects do you do?
    Hmm, worst case, AAB, best case A*A*A ... other than that, I really can't tell
    How about you?

    I only have M2 left! you?
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    I know it's probably already been done, but anyone like to guess grade boundaries? Here's mine -

    A* 59
    A 52
    B 46
    C 41
    D 36
    E 31
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    (Original post by ReTurd)
    That was worth 3 marks for some reason..
    All i did was write that as the answer and no working or anything, would i get all 3 marks?
    You would. There was nothing else to add really.
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    (Original post by f1mad)
    Not yet, got one more exam to go then I will .

    How about you?
    Oh cool, which exam? I've still got 4 and yeah I did mine a while back, put (in preference order) Arthur Vick, Sherbourne, Bluebell, Rootes and Whitefields (???)
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    (Original post by LGrosvenor101)
    Oh cool, which exam? I've still got 4 and yeah I did mine a while back, put (in preference order) Arthur Vick, Sherbourne, Bluebell, Rootes and Whitefields (???)
    D2 .

    Good luck!

    Sounds good .

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