Răspuns :
(x+2)(x-2) = [tex] x^{2} -4[/tex]
deci
[tex] x^{2} -4+ x^{2} +4= 2 x^{2} => x= \sqrt{2} [/tex]
deci
[tex] x^{2} -4+ x^{2} +4= 2 x^{2} => x= \sqrt{2} [/tex]