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Math Help - Summation Notation Problem

  1. #1
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    Summation Notation Problem

    How could this be simplified in summation notation:

    5 * y1 + 25 * y2 + 125 * y3

    Thanks!
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  2. #2
    Like a stone-audioslave ADARSH's Avatar
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    Welcome to the forum

    5 \times y^1 + 25 \times y^2 + 125 \times y^3

    (5\times y)^1 +(5\times y)^2 + (5\times y)^ 3

     <br />
\sum_{r= 1}^{3}{(5\times y)^r} <br /> <br />
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  3. #3
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    Thanks, ADARSH.

    What about this, if I was putting it in summation notation using sigma?

    4 * x(sub)i + 4 * x(sub)i^2 + 4 * x(sub)i^3 + 4 * x(sub)i^4

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  4. #4
    Like a stone-audioslave ADARSH's Avatar
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    Quote Originally Posted by genkislaw View Post
    Thanks, ADARSH.

    What about this, if I was putting it in summation notation using sigma?

    4 * xi + 4 * xi^2 + 4 * xi^3 + 4 * xi^4

    Thanks!
    4 \times \xi + 4 \times \xi^2 + 4 \times \xi^3 + 4 \times \xi^4

    = 4( \xi +  \xi^2 +  \xi^3 + \xi^4)

    = 4 \sum_{r=1}^{4}{\xi}^r.....\text{I can't really understand x(sub)i but you can put it in place of }\xi

    Guess : I think you mean x_i ...if its so then your answer is

    ~ =~ 4 \sum_{r=1}^{4}{x_i}^r
    Last edited by ADARSH; February 23rd 2009 at 11:09 PM. Reason: guess added
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  5. #5
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    Thanks!
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