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is this the one where i foil them with their according value? Or is something to do with finding the angle between?

Veteran  Mar 21, 2017
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 #1
avatar+26251 
+1

You scale u by -4 (i.e. you multiply each component by -4) and then add the result to v (i.e. just add corresponding components).

 

-4<-7, 1> + <3, 17>  →  <28, -4> + <3, 17> → <31, 13>

Alan  Mar 21, 2017

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