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    Please can you help, I think i'm going wrong but i'm not sure how.
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    (Original post by Louise_1988)
    Please can you help, I think i'm going wrong but i'm not sure how.

    P.S. please ignore the fact I couldn't get the divide by factorials underneath, I know they should be there. Sorry.
    Aha, have you forgot to use the factorials for the coefficients??
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    (Original post by zazy)
    Aha, have you forgot to use the factorials for the coefficients??
    I have changed it, is this now right??
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    (Original post by Louise_1988)
    I have changed it, is this now right??
    Yeah, that should do the trick!!!
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    (Original post by zazy)
    Yeah, that should do the trick!!!
    Thanks
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    An easier way is just to change it to

    (1/5)^6(x/5 - 1)^6

    And just use the nCr notation instead of using the factorials etc..
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    The coefficients are still wrong!
    they should be,

    1 6 15 20 15 6 1

    I use Pascal's triangle to get these numbers. It's usually a lot faster.

    In the third term, where you have,

    5(4)x^4(-5)²
    -------------
    2!

    that should have been,

    6(5)x^4(-5)²
    -------------
    2!

    and so on for the other terms. They should have started with the number 6, rather than 5.
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    (Original post by Fermat)
    The coefficients are still wrong!
    they should be,

    1 6 15 20 15 6 1

    I use Pascal's triangle to get these numbers. It's usually a lot faster.

    In the third term, where you have,

    5(4)x^4(-5)²
    -------------
    2!

    that should have been,

    6(5)x^4(-5)²
    -------------
    2!

    and so on for the other terms. They should have started with the number 6, rather than 5.
    aah... I realise I have made a rather fundamental mistake, will have to re-do it. Thanks for pointing it out.
 
 
 

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