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Math Help - vector direction

  1. #1
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    Post vector direction

    True or false--
    the unit vector in the direction of <4, -3> is <4/5, 3/5>.

    I say true, am I correct?

    When I used the direction formula, I came up with <4/5, -3/5>. Is this the same vector as <4/5, 3/5>?
    Thanks for your help!
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  2. #2
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    the unit vector will either be <4/5, <-3/5> or the exact oposite of the that vector which is <-4/5, 3/5>
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  3. #3
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    Post

    ok, these are the choices I'm given.

    Unit vector in direction of <4, -3> is:

    a. <4/25, -3/25>

    b. <4/sqrt7, -3/sqrt7>

    c. <4/5, 3/5>


    Would it be c?
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  4. #4
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    Quote Originally Posted by live_laugh_luv27 View Post
    ok, these are the choices I'm given.
    Unit vector in direction of <4, -3> is:
    a. <4/25, -3/25>
    b. <4/sqrt7, -3/sqrt7>
    c. <4/5, 3/5>
    As written the answer is not given.

    The answer is \left\langle {\frac{4}{5},\frac{{ - 3}}{5}} \right\rangle .
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