Question

Solutiile reale ale ecuatiei x^2=a,a apartine lui Q

Answer 1

Salut,

$x_{\tiny{1,2}}=\pm\sqrt{a}.$

Green eyes.

Answer 2

pt a>0, x1,2=+/-√a∈R

pt a=0, x1=x2=0∈R

pt a<0, S∩R=∅, adica nu are solutii reale

as clasic as that!!