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Coplanar math problem

  • Thread starter the.flea
  • Start date
23
0
1. Homework Statement
Find all values of t so that the three vectors a=(1,2,3) b=(4,5,6) and c=(7,8,t) are coplanar.


2. Homework Equations
(axb) [tex]\bullet[/tex] c=0


3. The Attempt at a Solution

(1, 2, 3) x (4, 5, 6)
(-3,6,-3)
(-3,6,-3)[tex]\bullet[/tex](7,8,t)
27=3t
t=9

it says find ALL values of t. i keep getting 9 through different combinations. is there only one value of t? thnks
 
Last edited:

Answers and Replies

Dick
Science Advisor
Homework Helper
26,258
618
Yes, there is only one value of t. If you'd gotten 27=0*t for your last equation then any t would work. But you didn't.
 

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