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    How do I get from
    (p−q)x=2a(p−q)+a(p^3 −q^3) to x=a(p^2 +q^2 +pq+2)
    I just can't see it, am I supposed to factorise (p^3-q^3) somehow?
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    (Original post by katie*may)
    How do I get from
    (p−q)x=2a(p−q)+a(p^3 −q^3) to x=a(p^2 +q^2 +pq+2)
    I just can't see it, am I supposed to factorise (p^3-q^3) somehow?
    If you don't know the factorisation of p^3 - q^3, you should work it out. Guess one of the roots and so on.

    note: p^3 - q^3 is quite common. It's one of the factorisations that's useful to memorise(like difference of squares).
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    (Original post by morgan8002)
    If you don't know the factorisation of p^3 - q^3, you should work it out. Guess one of the roots and so on.

    note: p^3 - q^3 is quite common. It's one of the factorisations that's useful to memorise(like difference of squares).
    Ive tried doing that but I can't seem to get it, would you please tell me what it is?
    I know it needs to have a (p-q) in it
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    Oh i think I've done it-
    is it (p-q)(p+q)(p+q)
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    (Original post by katie*may)
    Oh i think I've done it-
    is it (p-q)(p+q)(p+q)
    Nope. (p-q)(p^2 + pq + q^2)
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    (Original post by katie*may)
    Ive tried doing that but I can't seem to get it, would you please tell me what it is?
    I know it needs to have a (p-q) in it
    Yes, it has (p-q) in it. I guess you've been taught how to divide polynomials by long division. So do p-q ) \dfrac{}{p^3 - q^3}.
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    (Original post by Student403)
    Nope. (p-q)(p^2 + pq + q^2)
    Thankyou!!:adore:
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    (Original post by katie*may)
    Thankyou!!:adore:
    No worries Which chapter is this from btw? Or topic I guess, if the exam board isn't Edexcel modular
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    (Original post by Student403)
    No worries Which chapter is this from btw? Or topic I guess, if the exam board isn't Edexcel modular
    Its Edexcel FP2 June 2007 Q8, its really an FP1 Q now though as they re organised the modules content in 2009 I think
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    (Original post by katie*may)
    Its Edexcel FP2 June 2007 Q8, its really an FP1 Q now though as they re organised the modules content in 2009 I think
    Oh okay. I'm starting FP2 in December. How difficult are you finding it?
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    (Original post by Student403)
    Oh okay. I'm starting FP2 in December. How difficult are you finding it?
    Not too bad so far but we only started it last week haha
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    (Original post by katie*may)
    Not too bad so far but we only started it last week haha
    Lesson from every Edexcel module ever: Chapter 1 NEVER tells you the right difficulty lol

    I did quite well on FP1, but everyone in the year above says FP2 is hard as hell. Quite nervous about starting it tbh
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    (Original post by Student403)
    I did quite well on FP1, but everyone in the year above says FP2 is hard as hell. Quite nervous about starting it tbh
    I did AQA FP3, which I believe covers roughly the same content as Edexcel FP2. It's mostly an extension of C3-4, being calculus-based. I'd say it's a fair amount more difficult than C3-4, but very interesting.
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    (Original post by morgan8002)
    I did AQA FP3, which I believe covers roughly the same content as Edexcel FP2. It's mostly an extension of C3-4, being calculus-based. I'd say it's a fair amount more difficult than C3-4, but very interesting.
    Well that's great to hear! I heard yeah that the FPs are interesting modules. I loved FP1 so much
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    the tricky thing here is factorising that p - q to the power 3 term for the division, which is simple and i think others have showed that, errrr otherwise its easy question
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    (Original post by Student403)
    Well that's great to hear! I heard yeah that the FPs are interesting modules. I loved FP1 so much
    Yeah, AQA have four and I took them all. They were my favourite modules and you cover a lot of content that you wouldn't otherwise cover until uni.
 
 
 
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