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kita coba car dgn cara melengkapkan kuadrat sempurna
x² - 2x√5 = 5
x² - 2x√5 + 5 = 5 + 5
(x - √5)² = 10 --> kedua ruas diakar
x - √5 = +- √10
x = √5 +- √10
jadi,
x₁ = √5 + √10
x₂ = √5 - √10
semoga membantu ya :)