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sleestak

  • 3 years ago

Given the following, x1=2 x2=-1 x3=-2 x4=5 x5=-4 x6=8 Find: 3 ∑ ( x subi - 1 ) 2 i=1

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  1. dpflan
    • 3 years ago
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    I think I can handle this ;)

  2. dpflan
    • 3 years ago
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    \[\sum_{i=1}^{i=3} (x_i - 1) ^2 \]

  3. amistre64
    • 3 years ago
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    the suspense is killing me :)

  4. dpflan
    • 3 years ago
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    You given 6 x_i values. The equation only wants you to consider x_i for (i=1 until i=3), that would be x1, x2, x3. The sigma is the symbol for sum. So the problem is to find the sum for the following events: plugging in each x_i subtracting 1 then squaring that. Hence you'll have 3 values that you then add to together to get the final value. \[ i=1, x_1 = 2, (2-1)^2 = 1\] \[i=2, x_2 = -1, ((-1) -1)^2 = ... \] ... and so on

  5. amistre64
    • 3 years ago
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    could we expand the binomial and pick it apart sum for sum?

  6. sleestak
    • 3 years ago
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    OH! THANK YOU. DPFLAN, you are the best <3

  7. dpflan
    • 3 years ago
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    @amistre64 for sure, that would create even more suspense!

  8. amistre64
    • 3 years ago
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    the butler did it, im sure of it ....

  9. dpflan
    • 3 years ago
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    with the candlestick?

  10. dpflan
    • 3 years ago
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    @sleestak No problem, glad I could help!

  11. amistre64
    • 3 years ago
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    yes, with the candlestick lol ... get a clue

  12. dpflan
    • 3 years ago
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    @sleestak I imagine you may have some more problems that are similar to this that you need to work on, so good luck

  13. sleestak
    • 3 years ago
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    thanks. I'll tell you what I come up with

  14. sleestak
    • 3 years ago
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    9

  15. sleestak
    • 3 years ago
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    oh no. sorry one sec

  16. sleestak
    • 3 years ago
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    14. OK. I think I can do the other problem. THANKS :D

  17. dpflan
    • 3 years ago
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    x1 -> 1 x2 -> 4 x3 -> 9 SUM = 14, yeah, you're now an expert it seems

  18. sleestak
    • 3 years ago
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    you guys need to list finance as the next subject :D

  19. dpflan
    • 3 years ago
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    http://openstudy.com/study#/groups/Finance

  20. dpflan
    • 3 years ago
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    It actually had/has a pretty strong following/support from a professor at NYU - http://pages.stern.nyu.edu/~adamodar/

  21. dpflan
    • 3 years ago
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    Math is the most active subject

  22. sleestak
    • 3 years ago
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    oh. excellent.

  23. dpflan
    • 3 years ago
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    So if your questions are mathematical, you'd probably be best served to ask them here because there is a greater mass of users in this group, so you're more likely get an answer.

  24. sleestak
    • 3 years ago
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    yeah totally. this is awesome! I am going to use this all the time in school

  25. dpflan
    • 3 years ago
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    awesome, tell your friends too! Also, I've the final question you asked about solved

  26. dpflan
    • 3 years ago
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    *got

  27. sleestak
    • 3 years ago
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    oh okay. let me post

  28. sleestak
    • 3 years ago
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    should I now 'close' this question?

  29. dpflan
    • 3 years ago
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    Yep

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