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Math Help - Summation notation

  1. #16
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    Quote Originally Posted by VonNemo19 View Post
    You plugged 'em in right, but unfortunately arrived at the wrong answer. What did you do after that?

    Look at my last post for a hint.
    lol I have no idea what to do after that, and yup it can't be negative. Welll..... x^2 - 2xy + y^2 wouldn't have anything to do with it, would it?
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  2. #17
    No one in Particular VonNemo19's Avatar
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    Quote Originally Posted by marie7 View Post
    lol i have no idea what to do after that, and yup it can't be negative.
    (3)^2+(-6)^2+(5)^2+(-12)^2=?
    Quote Originally Posted by marie7 View Post
    Welll..... X^2 - 2xy + y^2 wouldn't have anything to do with it, would it?
    No... But that's the sign of a mathematician - you noticed some squares, and then you started thinkin about how to simplify. Very good.
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  3. #18
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    (2+1)^2+(-3-3)^2+(10-5)^2+(-5-7)^2 =3^2+(-6)^2+5^2+(-12)^2=9+36+25+144=214.

    I am so done with this thread...
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  4. #19
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    Okay I can see AlephZero's post. -6^2 is 36 not -36. Thanks a lot everyone
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  5. #20
    No one in Particular VonNemo19's Avatar
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    Quote Originally Posted by marie7 View Post
    I got -146 again! What am I doing wrong? lol
    Haha. Take a breath, clear your mind......










    (2+1)=3 Squre it and get 9

    (-3-3)=-6 Square It and get +36

    (10-5)=5 Square it and get 25

    -5-7=-12 Square it and get +144

    Add 'em up and whadduya get?
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