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Vector coplanar question

  • Thread starter jarman007
  • Start date
  • #1
11
0

Homework Statement



The value of n so that vectors 2i + 3j - 2k , 5i + nj + k and -i + 2 j + 3k may be coplanar?

a)18 b)28 c)9 d)36


2. The attempt at a solution

I was not able to think of any step

so please help
 

Answers and Replies

  • #2
rl.bhat
Homework Helper
4,433
5
Hi jarman007, welcome to PF.
The vectors A, B and C are coplanar if A.(BXC) = 0
 
  • #3
11
0
thanks and please check my solution

BxC = 10k -15j + nk + 3ni + j +2i = (3n+2)i -14j + (10+n)k


A.(BxC)=6n+4-42-20-2n=0

therefore n = 58/4
 
  • #4
rl.bhat
Homework Helper
4,433
5
BxC = 10k -15j + nk + 3ni + j +2i = (3n+2)i -14j + (10+n)k
This calculation is wrong.
Check i and j coefficients. My answer is 18.
 
  • #5
11
0
thanks

got the answer
 

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