Question

X ao quadrado+ x-1=0

Answer 1

Resposta:

x = (–1 ± √5) / 2

Explicação passo a passo:

x² + x – 1 = 0

x = (–b ± √(b² – 4 • a • c)) / (2 • a)

x = (–1 ± √(1² – 4 • 1 • (–1))) / (2 • 1)

x = (–1 ± √(1 – 4 • (–1))) / 2

x = (–1 ± √(1 + 4)) / 2

x = (–1 ± √5) / 2