calculus

Given vectors u= (t, 2t, 3) and v=(2t, 5t, -1). For what values of t

a) are u and v parallel?
b) are u and v perpendicular?

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asked by Ashley
  1. to be parallel u = kv
    or in our case: 2t/t = 5t/2t = -1/3
    or
    2/1 = 5/2 = -1/3 which is a contradiction, so
    no value of t makes them parallel

    to be perp. u•v = 0
    2t^2 + 10t^2 - 3 = 0
    12t^2 = 3
    t^2 = 1/4
    t = ± 1/2

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    posted by Reiny
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