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-4x > 12
x > -12/4
x > -3
bisanya nomor satu :)
3x + 5 > 7x + 17
(3-7)x > (17-5)
-4x > 12
x < - 3
2.
2 + 3x < 5x + 1 < 16
ini pake dua tahap
2 + 3x < 5x +1 atau 5x +1 < 16
2-1 < 5x-3x atau 5x < 16-1
1 < 2x atau 5x < 15
x > 1/2 atau x < 3
3. 2x^{2} + 7x - 15 ≥ 0
(2x -3)(x+5) ≥ 0
x ≥ 3/2 atau x ≤ -5
4.
(x - 2) / (x + 4) < 2
(x-2)/(x+4) - 2 < 0
{(x-2)-2(x+4) }/(x+4) < 0
(-x -10)/(x+4) < 0
(-x-10)(x+4) < 0
-x-10 = 0 atau x+4 = 0
x = 10 atau x = -4
HP x < 10 atau x > - 4