Asked by Devon

For the vectors u=(2,-3) and w=(-1,2), calculate |-3u| - |2w|.
Answered by Reiny
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?
Answered by Reiny
"and │-3u│ = √(36+81) = √117 = 2√13
"

should have said

and │-3u│ = √(36+81) = √117 = <b>2√13</b>
Answered by Reiny
Argghhhh!

<b>3√13</b>
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