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- 6 < x² + 5x < 6
kasus 1:
x² + 5x > - 6
x² + 5x + 6 > 0
(x + 2)(x + 3) > 0
x < - 3 atau x > - 2
kasus 2:
x² + 5x < 6
x² + 5x - 6 < 0
(x + 6)(x - 1) < 0
- 6 < x < 1
gabungannya:
HP: {x | - 6 < x < - 3 atau - 2 < x < 1, x ∈ R}