Question

resolva as eguasoes do 2° grau usando a formula geral
d)x²-x-1=0

Answer 1

x²-x-1=0

a = 1
b = -1
c = -1

Δ = b² - 4ac
Δ = (-1)² - 4.1.(-1)
Δ = 1 - 4.(-1)
Δ = 1 + 4
Δ = 5

x = -b ± √Δ / 2a

x = -(-1) ± √5 / 2.1

x = 1 ± √5 / 2

x' = 1+√5 / 2

x" = 1 - √5 / 2


S = {1-√5 / 2 , 1+√5 / 2}


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Gannicus
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