## anonymous one year ago Evaluate the expression: v ⋅ w Given the vectors: r = <8, 8, -6>; v = <3, -8, -3>; w = <-4, -2, -6>

1. anonymous

@IrishBoy123

2. IrishBoy123

you did the dot yourself last time so this should be easy! first re-check the question, $$\vec r$$ is irrelevant, is that right?

3. IrishBoy123

you just want $$\vec v \bullet \vec w$$, yes?

4. anonymous

yeah

5. anonymous

but how do I do the dot with three numbers?

6. IrishBoy123

for the dot you just multiply the x component of each vector, the y component of each and the z component of each, and add the lot up make sense?

7. anonymous

oh hyeah okay just a min

8. anonymous

dot: (3)(-4)+(-8)(-2)+(-3)(-6)=22

9. IrishBoy123
10. anonymous

hahah so thats it?

11. IrishBoy123

yep

12. anonymous

sweet that was easy lol thanks!