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⇒ x - 1 ⇒ x + 1
⇒ - ( x - 1) = -x + 1 ⇒ - ( x + 1 ) = -x - 1
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a) x - 1 > x + 1
0 > 2 ⇔ Salah
b) -x + 1 > x + 1
-2x > 0
x < 0 ⇔ Benar
c) x - 1 > -x - 1
2x > 0
x > 0 ⇔ Dicoba dengan 2, ternyata salah.
d) -x + 1 > -x - 1
0 > -2 ⇔ Salah
HP = { x | x < 0, x ∈ R}