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    (Original post by cogito.)
    NO, if you use degrees you will get M0 A0 for final 2 marks because degree is not alternative method but the WRONG method.
    So many people seem in denial about this... calculus requires radians
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    What do you guys think Grade boundaries will be for an A*?
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    (Original post by Paraphilos)
    I'm not sure you should have been having to integrate that in the first place in C4. Was there a previous part to the question?
    whoops sorry think i got muddled. it was 3^2x. i must have gotten 9^x^2 from somewhere else. fml, i black out after such exams LOL.
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    (Original post by C++)
    Or simply let 3^(2x) = (3^(2)^x) = 9^(x);

    This then gives (1/ln(9) * 9^(x)) + C
    this is absolutely wrong!
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    (Original post by talkbiology)
    Rings a bell! for the volume of revolution I got 13pi / ln3, any confirmation?
    i got that too! wasnt sure though because i intergrated by substitution
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    for the last question part b, I did the right method but when I went to work out my cone for h I did 9- x co ord of Q instead of 2 lmaooo what an idiot :-( how many marks do people think I could still get ?

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    My answers for this paper were:
    1) 2+5x/4-25x^2/64
    3rt2/2
    181/128
    2)(2x-3y)/(3x+8y)=dy/dx
    +-(24/5,16/5)
    3)x=4ln(2)
    12+32ln(2)^2-32ln(2)
    4) A=5,1,3
    p=15
    31.82
    d=7.46
    5)27/32
    a=2 b=-5
    6)k=4
    4pi/3 + rt(3)/2
    7) 1/(p-2) - 1/p
    0.473
    8) x=2 - 1/ln3
    area = 13pi/ln3
    this is most of the questions that i wrote down my answers to, I am confident in most of them although I am prone to the occasional stupid mistake so if you disagree then I will not argue with you.
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    (Original post by mahatma ghandi)
    its 473 years, it's in 100s of years bro
    no it isn't
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    (Original post by JulianS96)
    I got the same thing too.
    Something like 12000 -6 = 4000e^1/2sin2t
    Then ln2.9985 = 1/2sin2t
    Therefor 2ln2.9985 = sin2t
    Therefore 2t equals Math Error
    P was population measured in thousands, so 4000 people meant P became 4
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    (Original post by PaulCJH)
    My answers, judging by other people's opinions I think they're right:
    Attachment 429779
    Thank you so much! If these are right then the only one I got wrong was 7c), the DE populations one where I didn't realise it was in thousands -.-
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    (Original post by Bustamove)
    with the 32ln(2)^2 -32ln(2) + 12, I simplified it even more to 64ln(2) - 32ln(2) +12... ended up getting 32ln(2) +12.... is that still correct or would I lose a mark?
    (ln(2))^2 is not the same as ln(2^2) or 2ln(2)
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    (Original post by sagar448)
    What do you guys think Grade boundaries will be for an A*?
    69/70
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    (Original post by abigail love)
    whoops sorry think i got muddled. it was 3^2x. i must have gotten 9^x^2 from somewhere else. fml, i black out after such exams LOL.
    Ok. In that case, you make a substitution of u(x) = 3^{2x} in order to solve the integral.
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    How many marks for integrating correctly, finding volume of cone correctly, but manipulation error in between, leading to the wrong answer?
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    **** THIS. Im off to ecaudor on Thursday, so I can drown my sorrows there
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    (Original post by joanneeve)
    anyone get 53pi/ ln3 for the last question?
    its 13pi/ln3 sorry :c
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    (Original post by rachelc142)
    for the last question part b, I did the right method but when I went to work out my cone for h I did 9- x co ord of Q instead of 2 lmaooo what an idiot :-( how many marks do people think I could still get ?

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    None 😉

    Probably 3 or 4
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    If I put 27.1 instead of 0.473 in question 7, I will lose only one mark right? I did put 0.473 as radian is default but then wonder why it is so short and changed it to degree . How sily I was


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    such a hard exam I had no time
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    VOTE NOW ON HOW YOU FOUND THIS EXAM!
    Click here: http://www.thestudentroom.co.uk/show....php?t=3407487
    Note: C4 JUNE 2015 UK paper ONLY!
 
 
 
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