≤0 So, either x2−4≤0 and [x]+2>0‌or‌‌x2−4≥0 For that x∈[−2,2] x∈[−1,∞] So, x∈[−1,2] And [x]+2<0, for which x∈(−∞,−2)∪[−2,−∞] and x∈(−∞,−2) So, x∈(−∞,−2) From the intervals, x∈(−∞,−2)∪[−1,2]