Question

Find the indicated dot product.

r = <9, -7, -8>, v = <3, 4, 7>, w = <6, -9, 7>

v ⋅ w

<-27, 28, 56>
<18, -36, 49>
18
31

Answer 1

do you know how to do dot product

Answer 2

I'm not the best

Answer 3

3x6 + 4x(-9) + 7x7

Answer 4

do i just have to simplify this?

Answer 5

yah

Answer 6

oh well you know how to do this :)
and yes just simplify

Answer 7

dot product gives a scalar (ie a number)

Answer 8

oh okay

Answer 9

can you help me simplify. That was the part i was having trouble with.

Answer 10

okay
3x6+4x(-9)+7x7=18-36+49=-18+49=31

Answer 11

Thanks :)

Answer 12

welcome!

Answer 13

I would go review some basic math if you are not able to figure out 3*6+4*-9+7*7

I only say this because it seems like if you are trying to do things like the dot product, then you should be able to do basic arithmetic.

Answer 14

I would agree with that too :)