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

Answer 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?

Answer 2

"and │-3u│ = √(36+81) = √117 = 2√13
"

should have said

and │-3u│ = √(36+81) = √117 = 2√13

Answer 3

Argghhhh!

3√13