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Karena simbolnya '<' maka
xa < x < xb
-4 < x < 3/2
kalikan kedalam :
2x² + 5x < 12
2x² + 5x - 12 < 0
faktorkan :
(x + 4)(2x - 3) < 0
Batas :
x = -4
x = 3/2
Cobakkan :
x < -4 hasil : postif
x < 3/2 hasil : negatif
Maka :
HP={x| -4 < x < 3/2 , x e R }