Question

În reperul cartezian xOy se considera punctele A (3;-1) B (1;0) C (2;-4)
Să se determine vectorul w =vector de 2AB-VECTORT DE BC
Dau funda

Answer 1

AB(vector) = (xB-xA, yB-yA)= (1-3)i+(0+1)j = -2i+j

=> AB(vector) (-2,1)

BC(vector) = (xC-xB, yC-yB) = (2-1)i+(-4-0)j = i-4j

=> BC(vector) (1,-4)

=>

w = 2AB-BC = 2(-2i+j) - (i-4j) = -4i+2j-i+4j = -5i+6j

=> w(-5, 6)