Question

Se dau vectorii a = 3i + 5j si b = -2i + 3j

a) Construiti vectorii in coordonate xOy
b) Aflati vectorul suma s
c) Aflatati vectorii diferenta d1 = a - b
d2 = b - a
d) Aflati produsul scalar dintre cei doi vectori​

Answer 1

Suma=3i+5j-2i+3j=i+8j
D1=3i+5j+2i-3j=5i-2j
D2=-2i+3j-3i-5j=-2j+5i
Produsul scalar=(3i+5j)(-2i+3j)=-6i•i+9i•j-10j•i+15j•j=-6•1+9•0-10•0+15•1=-6+15=9