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    Given that x=3^k and y=2^k express the following in the terms of x and y.

    a) 2^(k+1)

    I understand how to do this is it was the powers to x and y and you had to simplify it (making the bases the same etc) but I'm confused with this method.

    I have the answer, so will know when the method is right,

    Cheers in advance!


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    this seems v.difficult for C1 :eek:

    if you can use just one of x and y then it is not difficult... the question suggests you should use both ?
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    Well it's a question


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    Err.. what? The answer to the exact question you asked is just 2y (and is only GCSE level).. you're complaining about something the question isn't asking for
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    is it not 2*y?
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    Yeah that's the answer, but I don't understand why? Or how it works??


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    (Original post by LuckyEms)
    Yeah that's the answer, but I don't understand why? Or how it works??


    Posted from TSR Mobile
    pq+r = pq*pr
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    Okay so we know when you have the same base numbers and you multiply you just add the indices together
    therfore k must be an indice with base two and so must one, we can split it into

    2^k * 2^1

    2^k = y and 2^1 = 2

    2*y
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    Oohhhhhh ok brilliant, thank you for you help!!


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