Question

Daca a+b=3, atunci N=a(a-1)+2ab+b(b-1)=
Raspuns corect 6 vreau rezolvarea

Answer 1

N= $a^{2}$-a+2ab+$b^{2}$-b
N=a²+2ab+b²-a-b
N=(a+b)²-a-b
N=3²-(a+b)
N=3²-3
N=9-3
N=6