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rezolvati in multimea numerelor reale indicatiile: a. |x-1|+|x+1|<=4
b. |x^2-1|<1


Răspuns :

|x-1|+|x+1| ≤ 4
|x-1|≥0
x-1≥0
x≥1
|x+1|≥0
x+1≥0
x≥-1

x-1+x+1≤ 4
2x≤4
x≤2
x∈[-1; 1; 2]