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x² + 2x -15 ≤ 0
(x - 3)(x+5) ≤ 0
-5 ≤ x ≤ 3
x² + 2x - 9 ≥ -6
x² + 2x - 3 ≥ 0
(x+3) (x - 1) ≥0
x ≤ - 3 atau x ≥ 1
jadi -5 ≤ x ≤ -3 atau 1 ≤ x ≤ 3