math

For the vectors u=(2,-3) and w=(-1,2), calculate |-3u| - |2w|.

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asked by Devon
  1. if u=(2,-3) then -3u = (-6,9)
    and │-3u│ = √(36+81) = √117 = 2√13

    and │u│ = √(4+9) = √13

    what do you observe?

    can you finish it?

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    posted by Reiny
  2. "and │-3u│ = √(36+81) = √117 = 2√13
    "

    should have said

    and │-3u│ = √(36+81) = √117 = 2√13

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    posted by Reiny
  3. Argghhhh!

    3√13

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    posted by Reiny

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