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Math Help - Length of a vector

  1. #1
    Newbie El Sparko's Avatar
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    Length of a vector

    Hi Math help Forum

    I'm not sure if this is the right thread to be posting this in, so sorry.

    the question is to calculate |a x b| where

    a= i+j-k
    b=2i-j+3k

    I've worked out a x b to be 2i - 5j - 3k , but I'm not really sure as to where to go from here.

    any help would be great

    Thanks

    ES
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  2. #2
    Super Member
    earboth's Avatar
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    Quote Originally Posted by El Sparko View Post
    Hi Math help Forum

    I'm not sure if this is the right thread to be posting this in, so sorry.

    the question is to calculate |a x b| where

    a= i+j-k
    b=2i-j+3k

    I've worked out a x b to be 2i - 5j - 3k , but I'm not really sure as to where to go from here.

    any help would be great

    Thanks

    ES
    Calculate now the length (or the absolute value) of (2, -5, -3).

    You should get the result |\vec v| = \sqrt{38}
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