Question

determinati numarul rational x:
|x|=2;|x|=0;|x+1|=-1;|x|=1 supra 3

Answer 1

x=2 si x=-2
x=0
|x+1|≥0 deci x∈∅
x=1/3 si x=-1/3

Answer 2

[tex]\it |x|=2 \Leftrightarrow x=\pm2 \Leftrightarrow \begin{cases} x_1=-2 \\\;\\ x_2=2\end{cases}[/tex]

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|x + 1| = -1 ⇒ S = ∅  (deoarece modulul nu poate fi negativ)