Question

Determinati elementele multimii A={x apartine Z | |2+x| = 5

Answer 1

/2+x/=5

1). 2+x=5 → x=5-2 →x=3
2).2+x=-5 →x=-5-2 →x=-7

A={-7;3}

Answer 2

2+x = 5
x = 5-2
x=3
 si

x = 2-5
x= -7

x = { 2; -7 }