Question

In raportul cartezian x O y se considera punctele A ( 5,3 ) , B ( -1, 2 )
sa se calculeze vectori OA +OB

Answer 1

O(0,0)

OA=(Xo-Xa)i+(Y0-Ya)j

OA=(0-5)i+(0-3)j=5i-3j

OB=(Xo-Xb)i+(Yo-Yb)j

OB=(0+1)i+(0-2)j

OB=i-2j

OA+OB=5i-3j+i-2j=6i-5j