Question

dados u = (-3, 2, 1, 4) e v= (-4, 7, -3, 2), calcule 4 (u,-3v) e assinale a alternativa correta

Answer 1

Na verdade é 4.(u-3v)

-3v=-3(-4,7,-3,2)=(12,-21,9,-6)

u-3v=(-3,2,1,4)+(12,-21,9,-6)

u-3v=(-3+12,2-21,-3+9,2-6)=(9,-19,6,-4)
Daí 4(u-3v) =4(9,-19,6,-4)
=(36,-78,24,-16)