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posted by  FDRHS on 10/13/2008 10:29:51 AM  |  status: Live  

Find a Vector

Course Textbook Chapter Problem
Precalculus Precalculus (7th) by Sullivan 8.7 42 and 44
Question Details:
(42) Find a vector orthogonal to both u and w.
 
(44) Find a vector orthogonal to both u and j + k.
 
For both questions above:
 
Let u = 2i - 3j + k
 
Let w = i + j + 3k
 
Remember: the letters i, j and k are vectors.
 
 
 
 
 
If you do not know how to answer questions posted or if you are unsure about how to reply, please move on to the next question(s).  A wrong reply will only add to my confusion.  Clear? 

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posted by raiderx on 10/13/2008 10:37:17 AM  |  status: Live
Asker's Rating: Helpful   
FDRHS's comment:
"Are you sure?"
Response Details:
42) cross multiply u and w
 
 = (-9-1)i - (6-1)j +(2+3)k
= -10i -5j +5k
 
43) cross multiply u and j+k
 
 = (-3-1)i - (2)j +(2)k
 = -4i-2j+2k
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