Question

Consider u=(3,2) v=(1,5) and the angle between the vectors is 45. What is u times v?

a. 3
b. 4
c. 13
d.21

Answer 1

C) 13

Step-by-step explanation:

got it right on edge :)

Answer 2

Answer: C. 13

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Step-by-step explanation:

In general if we have these two vectors

u = (a,b)

v = (c,d)

Then the dot product of them is

u dot v = a*c + b*d

We multiply the corresponding coordinates, then add up the products.

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In this case,

u = (3,2)

v = (1,5)

u dot v = 3*1+2*5

u dot v = 3 + 10

u dot v = 13