Question

Evaluate the expression:

v ⋅ w

Given the vectors:

r = <5, -5, -2>; v = <2, -8, -8>; w = <-2, 6, -5>

Answer 1

@zaibali.qasmi

Answer 2

@hba

Answer 3

Do you know how to find the dot product? since it is asking for v and w you can ignore r

Answer 4

You must do ax*bx+ay*by+az*bz, you can do that ?

Answer 5

don't you just multiply each part (1st, 2nd, and 3rd) with it's corresponding part from the othervector and then add them? I was just double checking

Answer 6

Yes that is what you do!

Answer 7

simply multiply 1st term with 2nd with 2nd and 3rd with 3rd...and add them up..use usual sign if has..

Answer 8

(2*-2)+(-8*6)+(-8*-5)= ???
answer

Answer 9

So it's -12, right?

Answer 10

That's what I got!

Answer 11

Awesome! I just wanted to double check because I hate when I do something wrong because of something simple like bad math