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Yoshimasa
@Yoshimasa
January 2020
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Determine o valor de k para que a equação x2 - 2x - k = 0 possua duas raízes reais e iguais:
a) k= -4
b) k= -1
c) k=1
d) k=4
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maell18
Para que se tenha duas raizes reais e iguais, delta tem que ser igual a zero,
ou seja, ∆ = 0
x² - 2x - k = 0
a = 1
b = - 2
c = - k
∆ = 0
b² - 4ac = 0
(- 2)² - 4.1 (- k) = 0
4 + 4k = 0
4k = - 4
k = - 4/4
k = - 1
R.: Letra B
6 votes
Thanks 6
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Lista de comentários
ou seja, ∆ = 0
x² - 2x - k = 0
a = 1
b = - 2
c = - k
∆ = 0
b² - 4ac = 0
(- 2)² - 4.1 (- k) = 0
4 + 4k = 0
4k = - 4
k = - 4/4
k = - 1
R.: Letra B