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√(x + 1)² < √(2x - 1)² ... kedua ruas pangkatkan 2
(x + 1)² < (2x - 1)²
x² + 2x + 1 < 4x² - 4x + 1
x² - 4x² + 2x + 4x + 1 - 1 < 0
- 3x² + 6x < 0
3x² - 6x > 0
3x ( x - 2) > 0
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0 2
Hp = { x / x < 0 atau x > 2 ; x ∈ R }