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Bab Nilai MutlakMatematika SMA Kelas X
untuk gambar 2,
-9 < -3x < -1
-9/-3 > -3x/-3 > -1/-3
3 > x > 1/3
1/3 < x < 3
HP = { x | 1/3 < x < 3, x ∈ bilangan real }
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| (2x - 1) / (x + 3) | < 1
((2x - 1) / (x + 3))² < 1²
((2x - 1) / (x + 3))² - 1² < 0
(((2x - 1)/(x + 3)) + 1) (((2x - 1)/(x + 3)) - 1) < 0
((2x - 1 + x + 3)/(x + 3) . ((2x - 1 - x - 3)/(x + 3)) < 0
((3x + 2)/(x + 3)) . ((x - 4)/(x + 3)) < 0
(3x + 2) (x - 4) (x + 3) < 0
3x + 2 = 0 atau x - 4 = 0 atau x + 3 = 0
3x = -2 x = 4 x = -3
x = -2/3
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-5 -3 -1 -2/3 0 4 5
uji lokasi, masukkan 0
| (2x - 1) / (x + 3) | < 1
| (0 - 1) / (0 + 3) | < 1
| (-1) / 3 | < 1
1/3 < 1 (memenuhi)
uji lokasi, masukkan (-1)
| (2x - 1) / (x + 3) | < 1
| (2 . (-1) - 1) / (-1 + 3) | < 1
| -3/2 | < 1
3/2 < 1 (tidak memenuhi)
uji lokasi, masukkan (-5)
| (2x - 1) / (x + 3) | < 1
| (2 . (-5) - 1) / (-5 + 3) | < 1
| (-11) / (-2) | < 1
11/2 < 1 (tidak memenuhi)
HP = { x | -2/3 < x < 4, x ∈ bilangan real}