Question

Find a ⋅ b.

a = <5, 2>, b = <4, 5>

Answer 1

The dot product of a vector a=<u1,u2> and a vector b=<v1,v2> is
u1*v1+u2*v2

Answer 2

Just multiply first components
And multiply the second components
then just add those products

Answer 3

OH! That makes sense! I have another one as well could you help? Im really confused on it

Answer 4

I wil ltry

Answer 5

Evaluate the expression:
v ⋅ w
Given the vectors :
r = <8, 1, -6>; v = <6, 7, -3>; w = <-7, 5, 2>

Answer 6

@freckles

Answer 7

Would it be the same process? and in the end add them all where r is irrelevant to the problem?

Answer 8

@hero @abb0t

Answer 9

well you mean from the products first right?

Answer 10

that is the product of the first components
second components
third components

Answer 11

then add those products

Answer 12

What I mean is that I do the same step as above between the 3 variables and then add them?

Answer 13

yes
6(-7)+7(5)+(-3)(2) <---

Answer 14

But is the the answer ? Like cuz usually when I see "evaluate" I would think it would take more of an explanation lol. But Thank you !