Question

Scrie sub forma de interval multimea A={xeR/-2<_x+1/2+1 < 3}

Answer 1

-2amplificam cu 2+1<x+1/2+1 <3amplificam cu 2+1
-4-2 <x+1 <6+3
-6 <x+1 <9/-1
-6-1 <x+1-1 <9-1
-7 <x <8
x apartine intervalului (-7, 8)