Thread: evaluate given vectors

Please can someone help with this? I've been having a lot of problems with this. And if you could explain it an not just give me the answer, I'm trying to actually learn how to do this. Thank you for any help you can provide.

Evaluate the expression:

v ⋅ w

Given the vectors:

r = <8, 8, -6>; v = <3, -8, -3>; w = <-4, -2, -6>

Originally Posted by Itel

Please can someone help with this? I've been having a lot of problems with this. And if you could explain it an not just give me the answer, I'm trying to actually learn how to do this. Thank you for any help you can provide.
Evaluate the expression:
v ⋅ w
Given the vectors:
r = <8, 8, -6>; v = <3, -8, -3>; w = <-4, -2, -6>

.

Would it be
8*3
8*-8
-6*-3?

Originally Posted by Itel

Would it be
8*3
8*-8
-6*-3?

NO INDEED.

Apply the rule that I posted.

Which is 24+-64+18=-22?

Originally Posted by Itel

Which is 24+-64+18=-22?

Which is correct. The dot product gives a number.
Because it is negative tells us that the angle between the vectors is obtuse.

So that's the answer? -22 and its obtuse?

are you taking an online course?

No. I'm in college.

Originally Posted by Itel

No. I'm in college.

REALLY? What in the world is that college is using as a textbook?
Please name both college and textbook, as well as the course name.

I find all your posts unbelievable coming from a college student studying anything to do with vectors.

Evaluate the expression:

v ⋅ w

Given the vectors:

r = <8, 8, -6>; v = <3, -8, -3>; w = <-4, -2, -6>

vector r = <8,8,-6> has no affect on the dot product of vectors v and w

What you don't believe me? :P

West Georgia Technical College
Math 1131 (which is calculus)
ISBN 978-1-133-22867-7 or 1-133-22867-4 (I don't which one is which)