Question

determinati toate valorile lui x , astfel incat 19 supra 2x+1 sa fie numar intreg

Answer 1

19 divizibil la (2x+1)=> 2x+1=±1 2x+1=±19=> 2x+1=-1=>x=-1 2x+1=1=>x=0 2x+1=-19=>x=-10 2x+1=19=>x=9 S={-10,-1,0,9}