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Math Help - Perpendicular vectors

  1. #1
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    Perpendicular vectors

    I've have another question

    how do you find a vector which is perpendicular to both 3i-6j-4k and -3i+2j+2k
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  2. #2
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    Quote Originally Posted by kandyfloss View Post
    how do you find a vector which is perpendicular to both 3i-6j-4k and -3i+2j+2k
    Find the cross-product: <3,-6,-4>\times<-3,2,2>.
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  3. #3
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    i need to find without using the cross product,since we haven't learnt that yet
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