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syarat akar:
x² - 3x + 2 ≥ 0
(x - 1)(x - 2) ≥ 0
x ≤ 1 atau x ≥ 2
x + 7 ≥ 0
x ≥ - 7
kuadratkan kedua ruas:
x² - 3x + 2 ≥ x + 7
x² - 4x - 5 ≥ 0
(x + 1)(x - 5) ≥ 0
x ≤ - 1 atau x ≥ 5