[tex]x^{2} +2=0\\x^{2} =-2[/tex]
Stiind ca [tex]x^{2} \geq 0, \forall x \in R[/tex] iar [tex]-2<0[/tex] rezulta ca ecuatia nu are solutii reale.
Are totusi solutiile complexe [tex]x_1=i\sqrt{2}, z_2=-i\sqrt{2}[/tex], unde [tex]i \in C, i=\sqrt{-1}[/tex]
