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    I'm stuck on the following question 13a) and 13b)

    13a) looks simple but I don't know how to add or subtract indices like this, here is my attempt

    I reckon if I get 13a right I can do 13b, does anyone know which indices rule this uses to add these indices together or subtract them or know a method of doing so? Any help is appreciated
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    (Original post by Sayless)
    I'm stuck on the following question 13a) and 13b)
    I reckon if I get 13a right I can do 13b, does anyone know which indices rule this uses to add these indices together or subtract them or know a method of doing so? Any help is appreciated
    Start with 13a:

    You have said that 2^p + 2^p = 4^p but this is not correct.

    2^p + 2^p = 2 \times 2^p = 2^1 \times 2^p = ...

    Can you correct this? Post your working if you're stil stuck.
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    (Original post by Sayless)
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    for part a)

     x + y = 2^p + 2^{-p} + 2^p - 2^{-p}

     x + y = 2(2^p)

     x + y = 2^{p+1}

    Do the same for x - y and hopefully part b can be easily done from here

    Edit: Notnek was here first, ill let him help you
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    Thanks for that advice, I'll have to remember that, I'll write it down on a flashcard
 
 
 
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