C4 Q

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  1. uxa595's Avatar
    1 13-06-2012  00:27
    • Peer Of The TSR Realm
    • Posts: 1,568
    C4 Q
    http://store.aqa.org.uk/qual/gce/pdf...W-QP-JUN11.PDF
    http://store.aqa.org.uk/qual/gce/pdf...W-MS-JUN11.PDF

    Q8b, the final mark.

    I can't seem to get from 1/(1-x) -1 to x/(1-x)

    Can anyone help?
  2. raheem94's Avatar
    2 13-06-2012  00:31
    • TSR Demigod
    • Posts: 5,512
    Re: C4 Q
    (Original post by uxa595)
    http://store.aqa.org.uk/qual/gce/pdf...W-QP-JUN11.PDF
    http://store.aqa.org.uk/qual/gce/pdf...W-MS-JUN11.PDF

    Q8b, the final mark.

    I can't seem to get from 1/(1-x) -1 to x/(1-x)

    Can anyone help?
    \displaystyle \frac1{1-x} - 1 = \frac1{1-x} - \frac{1(1-x)}{1-x} = \frac{1-(1-x)}{1-x} = \frac{x}{1-x}
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  3. Lord of the Flies's Avatar
    3 13-06-2012  00:33
    • The foul fiend Flibbertigibbet
    • Location: Paris, France
    Re: C4 Q
    (Original post by uxa595)
    http://store.aqa.org.uk/qual/gce/pdf...W-QP-JUN11.PDF
    http://store.aqa.org.uk/qual/gce/pdf...W-MS-JUN11.PDF

    Q8b, the final mark.

    I can't seem to get from 1/(1-x) -1 to x/(1-x)

    Can anyone help?
    \dfrac{1}{1-x}-1=\dfrac{1-1+x}{1-x}=\dfrac{x}{1-x}
  4. uxa595's Avatar
    4 13-06-2012  00:33
    • Peer Of The TSR Realm
    • Posts: 1,568
    Re: C4 Q
    (Original post by raheem94)
    \displaystyle \frac1{1-x} - 1 = \frac1{1-x} - \frac{1(1-x)}{1-x} = \frac{1-(1-x)}{1-x} = \frac{x}{1-x}
    Thanks

    I'm surprised i managed 100 UMS on this one. The boundaries seem ridiculously low.
  5. Lord of the Flies's Avatar
    5 13-06-2012  00:33
    • The foul fiend Flibbertigibbet
    • Location: Paris, France
    Re: C4 Q
    Woops, someone already replied!
  6. raheem94's Avatar
    6 13-06-2012  00:37
    • TSR Demigod
    • Posts: 5,512
    Re: C4 Q
    (Original post by uxa595)
    Thanks

    I'm surprised i managed 100 UMS on this one. The boundaries seem ridiculously low.
    No problem.

    I don't have much idea about AQA grade boundaries but well done
  7. Sagacious's Avatar
    7 13-06-2012  00:43
    • Peer Of The TSR Realm
    • Posts: 1,670
    Re: C4 Q
    dammit! by the time I figure out how to lay it our clearly it Latex, Raheem swoops in haha.

    I got owned... again.
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