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Given one cross product, find another cross product

by Colts
Tags: cross, product
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Colts
#1
Sep16-12, 12:35 PM
P: 77
1. The problem statement, all variables and given/known data
Calculate the cross product assuming that u X w = <-7,1,8>
Find (-3u + 4w) X w = ?


2. Relevant equations
I'm not sure. I know you have to relate the cross product to something inorder to find what u and w are, but don't know what equations to use.


3. The attempt at a solution
Don't know where to start
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damabo
#2
Sep16-12, 01:17 PM
P: 54
I think it is best if you use these 3 characteristics.
1. u x w = u w sin(theta)
2. λu x w = λ (u x w)
3. (u + v) x w= u x w + v x w


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