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2 October, 11:29

Find a ⋅ b. a = 4i - 4j, b = 4i + 5j

-4

-36

+1
Answers (1)
  1. 2 October, 11:48
    0
    A · b = a₁b₁ + a₂b₂ + ... = n

    a · b = (4*4) + (-4*5) = 16 - 20 = - 4
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