Given the vectors u = (5, 3) and v = (-1, 1), determine the quantity indicated below:
-2u times 2v

Question

Given the vectors u = (5, 3) and v = (-1, 1), determine the quantity indicated below:
-2u times 2v

anonymous · Answer

I've been stuck on this question for two days, your help would be appreciated

anonymous · Answer

what do you mean by u "times" v...there are several ways to multiply vectors.  Dot product?

anonymous · Answer

I mean multiply, sorry. And yes I've used the dot product but I keep getting the wrong answer

anonymous · Answer

are you supposed to use the dot product on this one is my question?

anonymous · Answer

I'm not sure, because the question doesn't clarify. I have my notes and example problems in front of me and none of them are set up or worded like this problem

anonymous · Answer

Assuming multiply means take the dot product: $$-2 \vec{u}=<-10,-6>$$and$$2\vec{v}=<-2,2>$$Taking the dot product:$$<-10,-6>*<-2,2>=20-12=8$$

anonymous · Answer

Oh, I see what I was doing wrong, I didn't subtract once I multiplied, thank you so much

anonymous · Answer

no problem