dominikkovar09 dominikkovar09
  • 21-10-2019
  • Mathematics
contestada

Let u = <-5, -9>, v = <6, 8>. Find -8u - 2v. (2 points)

<52, 88>

<-8, 2>

<112, -28>

<28, 56>

Respuesta :

Аноним Аноним
  • 21-10-2019

Multiplying a vector by a scalar means to multiply each coordinate of the vector by said scalar:

[tex]u = (-5, -9) \implies -8u = (40, 72)[/tex]

[tex]v = (6, 8) \implies 2v = (12, 16)[/tex]

Vectors are summed/subtracted by summing/subtracting correspondent coordinates:

[tex]-8u-2v = (40, 72) - (12, 16) = (40-12, 72-16) = (28, 56)[/tex]

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