Răspuns :
[tex] n^{2} +4n+3=0[/tex]
Calculam discriminantul Δ=[tex] 4^{2}-4*1*3=4>0 [/tex]=>
[tex] x_{1}= \frac{-4+2}{2} =-1 x_{2}= \frac{-4-2}{2} =-3 [/tex]
Calculam discriminantul Δ=[tex] 4^{2}-4*1*3=4>0 [/tex]=>
[tex] x_{1}= \frac{-4+2}{2} =-1 x_{2}= \frac{-4-2}{2} =-3 [/tex]