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HJ21
@HJ21
April 2022
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Qual a resposta e a conta da inequação em anexo
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daisycastro
Verified answer
X² - 2x - 3 ≤ 0
a = 1
b = - 2
c = - 3
Δ = b² - 4ac
Δ = (-2)² - 4 . 1 . (-3)
Δ = 4 + 12
Δ = 16
x = - b + - √Δ/2a
x = - (-2) + - √16/2.1
x = + 2 + - 4/2
x' = 6/2 ⇒
x' = 3
x" = - 2/2 ⇒
x" = - 1
S = { x ∈ R/ - 1 ≤ x ≤ 3 }
5 votes
Thanks 3
daisycastro
de nada, bons estudos!!!!!
daisycastro
Obrigado por marcar como a melhor resposta!!!!!
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Lista de comentários
Verified answer
X² - 2x - 3 ≤ 0a = 1
b = - 2
c = - 3
Δ = b² - 4ac
Δ = (-2)² - 4 . 1 . (-3)
Δ = 4 + 12
Δ = 16
x = - b + - √Δ/2a
x = - (-2) + - √16/2.1
x = + 2 + - 4/2
x' = 6/2 ⇒ x' = 3
x" = - 2/2 ⇒ x" = - 1
S = { x ∈ R/ - 1 ≤ x ≤ 3 }