anonymous
  • anonymous
Evaluate the expression. r = <9, -7, -1>, v = <2, 2, -2>, w = <-5, -2, 6> v ⋅ w I keep doing it and I end up with (7,4,-8), which isn't one of my answer choices, what am I doing wrong?
Mathematics
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SOLVED
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jamiebookeater
  • jamiebookeater
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geerky42
  • geerky42
dot product should be number, not vector.
geerky42
  • geerky42
Saying we have \(\large a = \langle a_x,a_y,a_z\rangle\) and \(\large b = \langle b_x, b_y, b_z \rangle\) Then we have \(\large a\cdot b = a_xb_x+a_yb_y+a_zb_z\)
anonymous
  • anonymous
Oh okay so I'm doing v x w?

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anonymous
  • anonymous
I just did it and ended up with -26
geerky42
  • geerky42
\(v\cdot w = -10+-4+-12 = \boxed{-26}\) So yeah.

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