SOLUTION: For u= i + j - 2k, v= 3i + j + 2k and w= 2i - 2j - 3k Will someone please show me how to find the cross product of u and w? Thanks, -Nick

Algebra ->  Vectors -> SOLUTION: For u= i + j - 2k, v= 3i + j + 2k and w= 2i - 2j - 3k Will someone please show me how to find the cross product of u and w? Thanks, -Nick      Log On


   

Question 333475: For u= i + j - 2k, v= 3i + j + 2k and w= 2i - 2j - 3k
Will someone please show me how to find the cross product of u and w?
Thanks,
-Nick
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
For u= i + j - 2k, v= 3i + j + 2k and w= 2i - 2j - 3k
Will someone please show me how to find the cross product of u and w?
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Use determinants.
|i +j +k|
|1 +1 -2| = cross product
|2 -2 -3|
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i(-3 - 4) -j(-3 + 4) + k(-2 - 2)
= -7i -j -4k