−4≤x≤−2-4 \leq x \leq-2−4≤x≤−2
2≤x≤42 \leq x \leq 42≤x≤4
−4≤x≤2-4 \leq x \leq 2−4≤x≤2
−2≤x≤3-2 \leq x \leq 3−2≤x≤3