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Math Help - Please help with this Question about functions

  1. #1
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    Please help with this Question about functions

    Hi I'm stuck on this question about functions.
    I have attached the question. It is Q7.
    I have done the first bit thats the simplify bit
    but I can't do the hence show f(x)=etc. bit.

    Also I'm stuck on the bit after that.
    Thats the hence show a(subscript n)=2^n+5^n

    Help with these two bits would be greatly appreciated.

    Thanks in advance for replies.
    Attached Thumbnails Attached Thumbnails Please help with this Question about functions-photo-3.jpg  
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