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JonathanSFonseca
@JonathanSFonseca
November 2019
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Como resolver essa Equação do 2° Grau passo-a-passo?
x² - x -1 = 0
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Olá!!!
Resolução!!
x² - x - 1 = 0
a = 1, b = - 1, c = - 1
∆ = b² - 4ac
∆ = ( - 1 )² - 4 • 1 • ( - 1 )
∆ = 1 + 4
∆ = 5
x = - b ± √∆ / 2a
x = - ( - 1 ) ± √5 / 2 • 1
x = 1 ± √5 / 2
x' = 1 + √5 / 2
x" = 1 - √5 / 2
Espero ter ajudado!!!
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Resolução!!
x² - x - 1 = 0
a = 1, b = - 1, c = - 1
∆ = b² - 4ac
∆ = ( - 1 )² - 4 • 1 • ( - 1 )
∆ = 1 + 4
∆ = 5
x = - b ± √∆ / 2a
x = - ( - 1 ) ± √5 / 2 • 1
x = 1 ± √5 / 2
x' = 1 + √5 / 2
x" = 1 - √5 / 2
Espero ter ajudado!!!