Question

determinati numerele intregi x care verifica relatia /f(x)/ ≤ 1, unde f:R-R, f(x)=x +1 supra 3

Answer 1

lf(x)l≤1 <=>
-1≤f(x)≤1=> f(x)={-1,0,1}
(x+1)/3=-1=>  x+1=-3  x1=-4, 
(x+1)/3=0 => x=-1 
(x+1)/3=1=> x+1=3 x=2
x={-4,-1,2}