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Elvandosantoscerq
@Elvandosantoscerq
November 2019
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MATEMATICAMENTE
........30 PONTOS
EQUAÇÕES 2*..........
.........
A.....
3x^2+x-2=0..........
B......
9x^2+3x-2=0......
C......
9x^2+3x+2=0.....
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jjzejunio
A) 3x² + x - 2 = 0
a = 3
b = 1
c = -2
∆ = 1² - 4.3.(-2)
∆ = 1 + 24
∆ = 25
x = -1 ± √25/2.3
x = -1 ± 5/6
x' = -1 - 5/6 = -6/6 = -1
x" = -1 + 5/6 = 4/6 = 2/3
S={ -1, 2/3 }
=============================
B) 9x² + 3x - 2 = 0
a = 9
b = 3
c = -2
∆ = 3² - 4.9.(-2)
∆ = 9 + 72
∆ = 81
x = -3 ± √81/2.9
x = -3 ± 9/18
x' = -3 + 9/18 = 6/18 = 1/3
x" = -3 - 9/18 = -12/18 = -2/3
S={ 1/3, -2/3 }
===========================
C) 9x² + 3x + 2 = 0
a = 9
b = 3
c = 2
∆ = 3² - 4.9.2
∆ = 9 - 72
∆ = -63
Não há raiz real!
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elvandosantoscerq
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Lista de comentários
a = 3
b = 1
c = -2
∆ = 1² - 4.3.(-2)
∆ = 1 + 24
∆ = 25
x = -1 ± √25/2.3
x = -1 ± 5/6
x' = -1 - 5/6 = -6/6 = -1
x" = -1 + 5/6 = 4/6 = 2/3
S={ -1, 2/3 }
=============================
B) 9x² + 3x - 2 = 0
a = 9
b = 3
c = -2
∆ = 3² - 4.9.(-2)
∆ = 9 + 72
∆ = 81
x = -3 ± √81/2.9
x = -3 ± 9/18
x' = -3 + 9/18 = 6/18 = 1/3
x" = -3 - 9/18 = -12/18 = -2/3
S={ 1/3, -2/3 }
===========================
C) 9x² + 3x + 2 = 0
a = 9
b = 3
c = 2
∆ = 3² - 4.9.2
∆ = 9 - 72
∆ = -63
Não há raiz real!