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Easy Ratio Vector Question, but not sure if answer is wrong

  • Thread starter geoff18
  • Start date
  • #1
18
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Homework Statement


Let A, B be points in R3 with position vectors

a:(7,-2,3)
b:(1,-5,0)

Let Q be the point on AB such that AQ= 2/3 AB
Find q, the position vector of Q

Homework Equations


The back of the book says the answer is: (2,-3,-1)

The Attempt at a Solution


First, I found the vector of AB: (-6,-3,-3)
So Q should be: a+(2/3)(AB)
ie: (7,-2,3)+(-4,-2,-2)
=(3,-4,1)
Which is different to the answer given by the book.
Did i do anything wrong?
Thanks
 

Answers and Replies

  • #2
12
0
What you have done is right
 

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