x² + x(1 - √5) - √5 = 0
D = b² - 4ac
D = (1 - √5)² - 4 * 1 * (-√5) = 1 - 2√5 + 5 + 4√5 = 1 + 2√5 + 5
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x² + x(1 - √5) - √5 = 0
D = b² - 4ac
D = (1 - √5)² - 4 * 1 * (-√5) = 1 - 2√5 + 5 + 4√5 = 1 + 2√5 + 5