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Math Help - Complicated Function

  1. #1
    Junior Member
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    Complicated Function

    Hi,
    please find attached the problem and the answer. I can't anderstand the first and second step of the answer. I only need a link for the topic or maybe method he used. Bdw I haven't tried to figure out the second answer but for now I only need help tackling the first one.
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  2. #2
    Junior Member
    Joined
    May 2010
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    f(n+1) = 15^(n+1) - 8^(n-1)

    8f(n) =
    8.15^n - 8.8^(n-2) = 8.15^n - 8^(n-1)

    f(n+1) - 8f(n) = 15^(n+1) - 8^(n-1) - 8.15^n + 8^(n-1)

    8^(n-1)-8^(n-1)=0

    -->f(n+1) - 8f(n) = 15^(n+1) - 8.15^n
    = 15^n(15-8)
    = 7. 15^n


    Sorry... im new to this forum how do i write in maths like with the exponents??
    Thank you
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  3. #3
    Senior Member Mukilab's Avatar
    Joined
    Nov 2009
    Posts
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    press the button to the left of the 'youtube' button and to the right of the 'php' button.

    or insert tags such as

    [math.][/math.] but do not include the dots

    e.g.
    7. 15^n =7.15^{n}
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