l2x + 1l 보다 크다

l2x + 1l 보다 크다

∵ │ x - 3 │ ≥ │ 2x + 1 │
∴ (x - 3) & sup 2; ≥ (2x + 1) & sup 2;
∴ x & sup 2; - 6x + 9 ≥ 4x & sup 2; + 4x + 1
∴ 3x & sup 2; + 10 x - 8 ≤ 0
∴ (3x - 2) (x + 4) ≤ 0
8756, x 8712, [- 4, 2 / 3]