Question

X=?
6 supra x+2. apartine lui N

Answer 1

$\frac{6}{x+2}$ ∈ N 
Divizorii lui 6 sunt:  1; 2; 3; 6
x + 2 = 1 => x =-1
x + 2 = 2 => x =0
x + 2 = 3 =>x=1
 x + 2 = 6=>x=4
=> x ∈ {-1 ;0;1;4}

Answer 2

x+2∈d6=[1,2,3,6];
⇒x∈N;
⇒x+2=[2,3,6];
⇒x=[0,1,4];