Vector cross product

  • Thread starter Cpt Qwark
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  • #1
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Homework Statement


Given a×b=-i-j+3k and c×a=2i-3j+k, find a×(a-2b+c)

Homework Equations


Cross product (DONE WITHOUT MATRICES).

The Attempt at a Solution


a[/B]×b=c=-(b×a)is all I'm getting to at this point
 

Answers and Replies

  • #2
SammyS
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Homework Statement


Given a×b=-i-j+3k and c×a=2i-3j+k, find a×(a-2b+c)

Homework Equations


Cross product (DONE WITHOUT MATRICES).

The Attempt at a Solution


a[/B]×b=c=-(b×a)is all I'm getting to at this point
Simply distribute the cross-product.

##\vec{P}\times(\vec{Q}+\vec{R})=\vec{P}\times\vec{Q}+\vec{P}\times\vec{R}##
 
  • #3
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Thanks,
so would I have to find the components of a, b, and c???
 
  • #4
SammyS
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Thanks,
so would I have to find the components of a, b, and c???
No. Not at all.

What is a×a ?
 
  • #5
Dick
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Thanks,
so would I have to find the components of a, b, and c???

No, you only need the components of axb and axc. Follow SammyS's suggestion.
 
  • #6
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Ok thanks guys I got it
 

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