2x² + x√5 – 15 = 0
D = (√5)² + 4·2·15 = 125 = (5√5)²
x₁ = (–√5 – 5√5) / 4 = –3√5 / 2
x₂ = (–√5 + 5√5) / 4 = √5
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2x² + x√5 – 15 = 0
D = (√5)² + 4·2·15 = 125 = (5√5)²
x₁ = (–√5 – 5√5) / 4 = –3√5 / 2
x₂ = (–√5 + 5√5) / 4 = √5