math;)

Find the unit vector in the direction of u=(-3,2). Write your answer as a linear combination of the standard unit vectors i and j.
a. u=-3[sqrt(13)/13]i+2[sqrt(13)/13]j
b. u=-3[sqrt(5)/5]i+2[sqrt(5)/5]j
c. u=3[sqrt(5)/5]i-2[sqrt(5)/5]j
d. u=3[sqrt(13)/13]i+2[sqrt(13)/13]j

I do not understand this. Can someone please explain it to me?

asked by girly girl
  1. |u| = √(9+4) = √13
    So, divide u by its length to get a unit vector (length=1)

    so, (a)

    If you've advanced to the point where you're studying vectors, your teacher should stop insisting on rational denominators. I much prefer 1/√13 to the cumbersome √13/13

    just sayin' ...

    posted by Steve
  2. Hey is there any way that we could talk one on one? Im pretty sure were im the same math class as you and want some help pls!! :))

    posted by Catneces

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