Respuesta :

That would be 2*1 + 4*-2 = 2 - 8 = -6 Answer
altavistard
I'd suggest writing this as

<2, 4> dot <1, -2>.  Another name for this is "scalar product."

Rule:  <a,b> dot <c,d> = ac + bd

Thus, 

<2, 4> dot <1, -2> comes out to (2)(1) + (4)(-2) = -6 (which is a scalar).

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