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#1 2016-04-26 06:10:39

honeyvp
Guest

Matrix

Pls help me friends.....

If x=ai+bj  , y=bj+ck , z=ai +ck, for which of the following triads (a,b,c) is x perpendicular to(z-y)?
  1)  (4 ,1 ,1)
  2)  (2 ,2 ,2)
  3)  (1 ,-1 ,1)
  4)  (-1, -2, 0
  5)  (1 ,2 ,0)

#2 2016-04-26 18:21:02

thickhead
Member
Registered: 2016-04-16
Posts: 1,086

Re: Matrix

Rather than matrix it is a problem on vectors.
z-y=ai-bj
For x to be perpendicular to z-y dot product must be =0
here dot product=


this is satisfied by triad (3)


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