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    Part (b)'s the troublemaker here, any guidance would be appreciated.
    (Just to get me started, please!)
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    Do you know what 'independent of x' means? It means x^0.

    What combination of x and 1/(x^2) give x^0?

    Next, don't expand it out, use the general term of the binomial expansion to find that value.
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    (Original post by Terminatoring)
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    Part (b)'s the troublemaker here, any guidance would be appreciated.
    (Just to get me started, please!)
    We use the nCR method- it is straightforward and organised

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    (Original post by CancerousProblem;[url="tel:55838283")
    55838283[/url]]Do you know what 'independent of x' means? It means x^0.

    What combination of x and 1/(x^2) give x^0?

    Next, don't expand it out, use the general term of the binomial expansion to find that value.
    Would 10 & 5 work? That's what came to my head, so I presume it's just a matter of thinking about it?

    In terms of getting the term alone, I was taught the method with 2! 3! Etc on the denominator so I'm not sure if it's easy thiswayway
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    (Original post by Terminatoring;[url="tel:55838533")
    55838533[/url]]Would 10 & 5 work? That's what came to my head, so I presume it's just a matter of thinking about it?

    In terms of getting the term alone, I was taught the method with 2! 3! Etc on the denominator so I'm not sure if it's easy thiswayway

    Actually I've just realised it isn't that hard to use. I got 96096 - gonna check the answer now, thanks !!'
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    Could I just clarify which exam board this is for? Stressing that I wouldn't have a clue what to do with that question!!


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    (Original post by hannahemily_xx;[url="tel:55838845")
    55838845[/url]]Could I just clarify which exam board this is for? Stressing that I wouldn't have a clue what to do with that question!!


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    It's edexcel, but it's a Solomon paper which are traditionally harder. Do you want me to explain it to you? I think it may depend on how you do the binomial expansion
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    (Original post by Terminatoring)
    It's edexcel, but it's a Solomon paper which are traditionally harder. Do you want me to explain it to you? I think it may depend on how you do the binomial expansion
    Oh gosh, same as me! Makes me feel a little bit better about that paper but that would be really kind of you if you wouldn't mind?
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    Sorry it's upside down! Is this correct for a? Still wouldn't know how to do b though if you wouldn't mind helping please? Thanks
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    I got K=2 and A=420 for a) is that right? and how do you do b)?
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    (Original post by hannahemily_xx;[url="tel:55839475")
    55839475[/url]]Oh gosh, same as me! Makes me feel a little bit better about that paper but that would be really kind of you if you wouldn't mind?
    No problem. Basically to get a term independent of x means to say there is no x term and thus you need to find a way to eliminate x. You must do this by finding the term where where the x^n is multiplied by the (k/x^2)^n the power of x is identical, so you divide by the same thing.

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    (Original post by Terminatoring)
    No problem. Basically to get a term independent of x means to say there is no x term and thus you need to find a way to eliminate x. You must do this by finding the term where where the x^n is multiplied by the (k/x^2)^n the power of x is identical, so you divide by the same thing.

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    Thank you so much, I understand now! Super helpful
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    (Original post by logicmaryam)
    I got that too!
    Well fingers crossed there's safety in numbers do you know which year it's from, I can check the mark scheme?
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    (Original post by hannahemily_xx;[url="tel:55840173")
    55840173[/url]]Thank you so much, I understand now! Super helpful
    No problem, glad I could help your answer to part (a) was correct btw, but if you'd like to check its Solomon J
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    (Original post by hannahemily_xx)
    Well fingers crossed there's safety in numbers do you know which year it's from, I can check the mark scheme?
    still don't know how to do b)... no sorry, just saw it here and gave it a try
 
 
 
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