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Math Help - Finding unit vectors

  1. #1
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    Finding unit vectors

    Hi, if anyone could please help i would greatly appreciate it!

    Directions: Find a unit vector in the direction of line PQ.
    P(7, -4) Q(-3, 2)

    the textbook say the answer is: 1/SquareRoot(34) * (-5, 3)
    sorry I don't know how to make the square root symbol...

    ok, so I know how to find unit vectors for single points. can anyone please explain how to do this one? is it similar to the other method?

    Thanks!
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  2. #2
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    find the vector PQ first which is (-10 , 6) , then divide by the magnitude of the vector to get a unit vector.
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  3. #3
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    Quote Originally Posted by bobak View Post
    find the vector PQ first which is (-10 , 6) , then divide by the magnitude of the vector to get a unit vector.

    This might be a stupid question, but how did you get (-10, 6) ??
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  4. #4
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    To find a unit vector in any direction, one divides by the length in that direction.
    If V is a non-zero vector then \frac{1}{{\left\| V \right\|}}<br />
is a unit vector parallel to V.
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