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x² +5x = -6
(x +25/10)² = -6 +25/10²
(x +25/10)² = -6 +625/100
(x +25/10)² = -600/100 +625/100
(x +25/10)² = 25/100
(x +25/10)² = 1/4
x₁ = +√1/4 -25/10
x₁ = +√25/100 -250/100
x₁ = +√-225/100
x₂ = -√-225/100
Jadi, akar-akarnya adalah +√-225/100 dan -√-225/100.