Question

rezolvati in multimea numerelor reale ecuatia $\sqrt{x+2} =x+2$

Answer 1

Punem conditii: x+2>0
Ridicam la patrat ambele parti ale ecuatiei
x+2=x^2+4x+4
x^2+3x+2=0
d=9-4*2=1
x1=-1, x2=-2
Doar x=-1 convine (verificam in conditii)