NotTim
  • NotTim
Given the vector a=[-4.1,7], b=[2,0,-3], and c=[1,-1,5], simplify b*(a+c). Cartesian Vectors of a Vectors Unit.
Mathematics
katieb
  • katieb
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NotTim
  • NotTim
My answer is [-6,0,-36]
NotTim
  • NotTim
Correct answer is -42.
anonymous
  • anonymous
so, its b dot (a+c)?

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NotTim
  • NotTim
Yes.
anonymous
  • anonymous
a + c = [-3, 0, 12]
anonymous
  • anonymous
[-3, 0, 12] dot [2, 0, -3] = -3(2) + 0(0) + -3(12) = -42
NotTim
  • NotTim
So I only add at the very end right?
NotTim
  • NotTim
Thanks.
anonymous
  • anonymous
add a and b first, then take the dot product with c

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