What is the dot product of the two vectors u = (2, -3, 5) and v = (4, 1, -2) in R^3?
Answer and explanation
Correct answer: B. -5
The dot product is u · v = u1v1 + u2v2 + u3v3 = (2 4) + (-3 1) + (5 -2) = 8 - 3 - 10 = -5.
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