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    (Original post by !Laxy!)
    Yay! It was soooooooooo easy!

    From the answers on here i've got 72 out of 75. I dropped 2 marks on the amount of water going past the river thingy. and one mark on the first part of the trig as i got 1/3rt3 but no -ve sign.

    I reckon grade boundary for an A will be about 66/75 what do others think??
    the trig answer was definately -ve.

    About grade boundries: the overall grade at the end is not based only on P2 result, so how the hell can you say that the grade boundry will be anything like 66/75?? Based on the P1 paper it's likely to be about 73/75! And on P3 probably 60/75...66/75 is meaningless.
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    (Original post by !Laxy!)
    I thought f(x) was 2/x-1 so inverse was: (2/x) +1 If i remember correctly?
    f^(-1)(x)=(2/x)+1=(2+x)/(x) is what I got.
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    (Original post by CrazyChemist)
    the trig answer was definately -ve.

    About grade boundries: the overall grade at the end is not based only on P2 result, so how the hell can you say that the grade boundry will be anything like 66/75?? Based on the P1 paper it's likely to be about 73/75! And on P3 probably 60/75...66/75 is meaningless.
    Yes it is. each exam has different grade boundries. Any P2 likley to be about 61 id say. maybe a little more.
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    (Original post by CrazyChemist)
    the trig answer was definately -ve.

    About grade boundries: the overall grade at the end is not based only on P2 result, so how the hell can you say that the grade boundry will be anything like 66/75?? Based on the P1 paper it's likely to be about 73/75! And on P3 probably 60/75...66/75 is meaningless.
    It is based only on the P2 paper

    Todays was very similar to June 2003 which was 66/75 for an A
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    (Original post by chats)
    oh yeh sorry f(x) was 2/x-1
    right:

    f(x) = 2/(x-1) so just switch f(x) for y:

    y = 2/(x-1)
    x-1 = 2/y
    x = 1+ 2/y

    f-1 = 1 + 2/x

    What was g(x)?
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    (Original post by chats)
    It is based only on the P2 paper

    Todays was very similar to June 2003 which was 66/75 for an A
    Eh? How is it based only on the P2 paper? you get a grade for maths, not one for each paper...
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    y = 2/x-1
    y(x-1) = 2
    yx - y = 2
    xy = 2 + y
    x = (2+y)/y
    inverse = (2+x)/x
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    (Original post by CrazyChemist)
    Eh? How is it based only on the P2 paper? you get a grade for maths, not one for each paper...
    Ye but each paper is scaled. I.e. P2 might be 61 to get 80UMS.
    U need 480UMS in total for an A. Based on the UMS scaling.
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    (Original post by Syncman)
    Ye but each paper is scaled. I.e. P2 might be 61 to get 80UMS.
    U need 480UMS in total for an A. Based on the UMS scaling.
    Each paper is scaled individually? I thought your marks were just added up at the end and scaled up or down.
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    (Original post by CrazyChemist)
    right:

    f(x) = 2/(x-1) so just switch f(x) for y:

    y = 2/(x-1)
    x-1 = 2/y
    x = 1+ 2/y

    f-1 = 1 + 2/x

    What was g(x)?
    g(x) was x² + 5
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    (Original post by CrazyChemist)
    Each paper is scaled individually? I thought your marks were just added up at the end and scaled up or down.
    Nope each paper is scaled individually.

    http://www.edexcel.org.uk/VirtualCon...ort_Jan_05.pdf

    See page 36 of 38. For which unit is which, see contents.
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    (Original post by josklkr)
    g(x) was x² + 5
    you want fg(1/4) yes?

    g(1/4) = (1/4)² +5
    = 1/16 +5
    = 81/16

    fg(1/4) = f(81/16)
    = 2/(81/16 - 1)
    = 2/(65/16)
    = 32/65
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    (Original post by Syncman)
    Nope each paper is scaled individually.

    http://www.edexcel.org.uk/VirtualCon...ort_Jan_05.pdf

    See page 36 of 38. For which unit is which, see contents.
    Ah right - thanks :rolleyes:
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    (Original post by CrazyChemist)
    you want fg(1/4) yes?

    g(1/4) = (1/4)² +5
    = 1/16 +5
    = 81/16

    fg(1/4) = f(81/16)
    = 2/(81/16 - 1)
    = 2/(65/16)
    = 32/65
    was the question fg(1/4) or fg(x)=1/4 ???
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    (Original post by CrazyChemist)
    you want fg(1/4) yes?

    g(1/4) = (1/4)² +5
    = 1/16 +5
    = 81/16

    fg(1/4) = f(81/16)
    = 2/(81/16 - 1)
    = 2/(65/16)
    = 32/65
    nah the question was fg(x) = ¼
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    (Original post by josklkr)
    nah the question was fg(x) = ¼
    oh damn - are you sure? That means x=2 or x =-2 yes (after quick calculation)?
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    yeh, but x>1 though i think
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    (Original post by sequence123)
    yeh, but x>1 though i think
    no thats only with the function f
    in the function g, x is any real number
    if you place any number into g you will get a positive number (because of x²) and it will be larger than 1 because of the + 5
    therefore any number you place into f will be larger than one
    therefore you can have -2
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    (Original post by !Laxy!)
    Yay! It was soooooooooo easy!
    I reckon grade boundary for an A will be about 66/75 what do others think??

    I hope that for an A, it will be 75/75, but that wont bother you as it was easy
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    I thought it was a relatively easy paper, because I hammered into revision after doing badly in January. Hopefully, I'm not delusional and I have done well. One question... in the volume of a revolution questions, I changed 2ln3 to ln9... or whatever the hell ln whatever the hell, I just raised it to the power, that is ok right?

    EDIT: I'm a ******, I've typed it the wrong way round.
 
 
 
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