Question

Find v-->*w--> if v-->= 5i--> -4j-->+4k--> and w-->= -6i-->+3j-->-2k-->

I am getting either -30i-12j-8k or -15i-6j-4k

But these are the only options
3i-4j-2
-14i-9j-4
5i+3j-4
-4i-14j-9k

Answer 1

\[\vec{v}=5\vec{i}-4\vec{j}+4\vec{k}\\
\vec{w}=-6\vec{i}+3\vec{j}-2\vec{k}\]
What is it you're supposed to do with v and w? It's hard to tell.

Answer 2

Multiply them

Answer 3

Do you mean find the cross product? That's the only way I can see vectors as being possible solutions. Meaning,
\[\text{Find } \vec{u}\times\vec{v}?\]

Answer 4

Yes that's what it's asking

Answer 5

Wait cross product? Not multiply?

Answer 6

Just found the formula thanks n.n I didn't know I had to do that

Answer 7

It's a form of vector multiplication. http://en.wikipedia.org/wiki/Multiplication_of_vectors
The first kind, the dot product, gives you a scalar.
The second kind, the cross product, gives you a vector.
I'm not as familiar with the other two listed, but they also give you vectors.

Answer 8

The answer is in vectors I just didn't want to put it

Answer 9

I got -4i -14j -9k c: thanks c: