Question

daca (2x+3)/6 si x €Z,atunci x €

Answer 1

D₆∈[-1,-2,-3,-6,1,2,3,6];
⇒2x+3=-1⇒2x=-4⇒x=-2;
⇒2x+3=-2⇒2x=-5⇒x=-5/2∉Z;
⇒2x+3=-3⇒2x=-6⇒x=-3;
⇒2x+3=1⇒2x=-2⇒x=-1;
⇒2x+3=3⇒2x=0⇒x=0;
⇒x∈Z;
⇒x∈[-3,-2,-1,0];