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    patr_2004's Avatar
    patr_2004 Posts: 3, Reputation: 1
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    #1

    Apr 1, 2012, 10:28 PM
    sequence and series
    Hi, please help me on this equation

    1) A sequence is defined by Un+1=Un+2Un-1
    a) Given that U11=683 and U8=85 deduce the equations
    U10+2U9=683
    U10- U9=170


    b) Find the value of U9
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Apr 3, 2012, 05:55 AM
    This is a continuation of the sam question you asked earlier here: https://www.askmehelpdesk.com/mathem...rs-647105.html

    If the sequence is



    The first question is simply applying n=10:



    For the second use n=9, and rearrange to get the result.
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