Question

4 pe x-3 apartine lui Z

Answer 1

...............................

Answer 2

4/(x-3) ∈ Z

x-3|4 => x-3∈ D4 

D4={-1,-2,-4,1,2,4}

 x-3 ∈ {-1,-2,-4,1,2,4} 

x ∈ {2,1,-1,4,5,7}