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    This is the question:

    Let u = -3i + j + k and v = mj + nk.

    Given that v is a unit vector perpendicular to u, find the possible values of m and n.

    All I have is m + n = 0 but the question is for 7 marks and I can't find anything else???

    :eek::confused:
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    (Original post by Gmart)
    This is the question:

    Let u = -3i + j + k and v = mj + nk.

    Given that v is a unit vector perpendicular to u, find the possible values of m and n.

    All I have is m + n = 0 but the question is for 7 marks and I can't find anything else???

    :eek::confused:
    v is a unit vector - this means that it has magnitude 1. Can you make an equation using this?
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    (Original post by Notnek)
    v is a unit vector - this means that it has magnitude 1. Can you make an equation using this?
    Ah yes - I was trying to make something out of root 11, but the squares of m and n equal 1, thanks
 
 
 
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