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Verified answer
(3x + 1)² ≤ 4²9x² + 6x + 1 ≤ 16
9x² + 6x + 1 - 16 ≤ 0
9x² + 6x - 15 ≤ 0
bagi 3
3x² + 2x - 5 ≤ 0
(x - 1)(3x + 5) ≤ 0
-5/3 ≤ x ≤ 1