Question

sendo u = (a,3), v = (1,-2) e w = 4,2b) calcule a e b , sabendo que : u -2v + 3w = 0

Answer 1

u = (a,3) ; v = (1,-2) ; w = (4,2b) 

Calcular a e b sabendo que  u - 2v + 3w = 0 → vetor nulo (0,0) 

(a,3) - 2(1,-2) + 3(4,2b) = (0,0)

(a,2) - (2,-4) + (12,6b) = (0,0)

a - 2 - 12 = 0  e  2 - (-4) + 4b = 0 

a -14 = 0 ⇔ a = 14

2 + 4 + 4b = 0 ⇔ 4b = -6 ⇔ b = -6/4 ⇔ b = -3/2

Ficando assim:

a = 14 e b = -3/2

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29/03/2016
Sepauto - SSRC
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