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Verified answer
Pertidaksamaannya(2x + 3)/(3x + 1) < 0
1) 2x + 3 = 0
2x = -3
x = -3/2
2) 3x + 1 = 0
3x = -1
x = -1/3
Buat garis bilangan
++++ (-3/2) ---- (-1/3) ++++
karena 'kurang dari 0' maka ambil daerah yg negatif
-3/2 < x < -1/3
HP = {x | -3/2 < x < -1/3, x € R}
Cara membuat tanda pada garis bilangan
1) kurang dari -3/2 => pilih x = -2
(2x + 3)/(3x + 1) = (2(-2) + 3)/(3(-2) + 1) = (-1)/(-5) = 1/5 => positif
2) antara -3/2 dan -1/3 => pilih x = -1
(2x + 3)/(3x + 1) = (2(-1) + 3)/(3(-1) + 1) = 1/-2 = -1/2 => negatif
3) lebih dari -1/3 => pilih x = 0
(2x + 3)/(3x + 1) = (2(0) + 3)/(3(0) + 1) = 3/1 = 3 => positif