Which interval satisfies ∣x2−1∣≤8|x^2 - 1| \le 8∣x2−1∣≤8?
[−3,3][-3, 3][−3,3]
[−7,7][-\sqrt{7}, \sqrt{7}][−7,7]
{−3}∪{3}\{ -3 \} \cup \{ 3 \}{−3}∪{3}
[−3,−1]∪[1,3][-3, -1] \cup [1, 3][−3,−1]∪[1,3]