Question

Help

Use the dot product to find [v] when v =(-2,-1)


A.-1

b.-3

c;sqr5

dsqr3

Answer 1

sqrt(5)

Explanation:

Honestly think this person means to find the magnitude of the vector. You can use dot product here, the vector with itself... But that isn't the last step.

v dot v=4+1=5

and so |v|=sqrt(5)