anonymous
  • anonymous
PLEASE HELP Evaluate the expression: v ⋅ w Given the vectors: r = <5, -5, -2>; v = <2, -8, -8>; w = <-2, 6, -5>
Mathematics
schrodinger
  • schrodinger
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imqwerty
  • imqwerty
-12 :)
anonymous
  • anonymous
how did you get that? @imqwerty
imqwerty
  • imqwerty
we need to find v.w we have- v=2i-8j-8k j=-2i+6j-5k for any 2 vectors a,b a.b= (product of their component along i)+(product of their component along j)+(product of their component along k) so v.j=(2x -2)+(-8x6)+(-8x -5) =-12

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anonymous
  • anonymous
ohh okay thank you so much, could you help me with one other question
imqwerty
  • imqwerty
ok
anonymous
  • anonymous
Find a ⋅ b. a = <7, 4>, b = <3, 5>
imqwerty
  • imqwerty
have u tried solving this problem??
imqwerty
  • imqwerty
41
anonymous
  • anonymous
i got 21,20
imqwerty
  • imqwerty
well a=7i+4j b=3i+5j a.b=(7x3)+(4x5) =21+20 =41

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