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(x+1)²-1=12
(x+1)²=13
x+1 =±√13
x = -1+ √13 atau x = -1-√13
HP={-1-√13 < x < -1+√13}
dengan menggunakan rumus khawarizmi akar2nya:
x₁₂ = (- b +- √(b² - 4ac))/2a
x₁₂ = (- 2 +- √52)/2
x₁ = (-2 + √52)/2
x₂ = (- 2 - √52)/2
HP: {x | (-2 - √52)/2 < x < (- 2 + √52)/2 }