Question

PLEASE HELP

Evaluate the expression:

v ⋅ w

Given the vectors:

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

Answer 1

-12 :)

Answer 2

how did you get that? @imqwerty

Answer 3

we need to find v.w
we have-
v=2i-8j-8k
j=-2i+6j-5k

for any 2 vectors a,b
a.b= (product of their component along i)+(product of their component along j)+(product of their component along k)

so v.j=(2x -2)+(-8x6)+(-8x -5)
=-12

Answer 4

ohh okay thank you so much, could you help me with one other question

Answer 5

ok

Answer 6

Find a ⋅ b.

a = <7, 4>, b = <3, 5>

Answer 7

have u tried solving this problem??

Answer 8

41

Answer 9

i got 21,20

Answer 10

well a=7i+4j
b=3i+5j
a.b=(7x3)+(4x5)
=21+20
=41