Răspunsuri

2014-05-30T16:14:44+03:00
X^2-4=0 ⇒ x^2=4⇒ x=2 sau  x=-2
x^2-9=0 ⇒ x^2=9⇒ x=3 sau x= -3
Ecuatia are 4 solutii deci x apartine {-3,-2,2,3}