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March 28, 2017

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Determine the value of k, so that u = [-3,7] and v = [16,k] are perpendicular.

  • Calculus - ,

    they're parallel

  • Calculus - ,

    it says determine the value of k so that u and v ARE perpendicular .... if it was parallel, i don't think it would ask me to find k....... unless it's a trick question ...

  • Calculus - ,

    slope of u = -7/3
    so slope of perpendicular to u = +3/7
    so
    3/7 = k/16
    7 k = 48
    k = 48/7

  • Calculus - ,

    or...


    their dot product must be zero

    (-3)(16) + 7k = 0
    7k = 48
    k = 48/7

  • Calculus - ,

    thank you everyone

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