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cassiiagabriela16
@cassiiagabriela16
October 2020
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Conjunto soluçãao
[tex] \frac{x^2-4x-5}{x^2-12x+20} < 0 [/tex]
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3478elc
Verified answer
x² - 4x - 5 = 0
Δ = (-4)² - 4.1.(-5) = 16 + 20 = 36
x = 4 +/-√36 ==> x = 4+/-6
2.1 2
x1 = 4+6==> x1 = 5
2
x2 = 4-6==> x2 = - 1
2
x² - 12x + 20 ≠ 0
Δ = (-12)² - 4.1.(20) = 144 - 80 = 64
x = 12 +/-√64 ==> x = 12+/-8
2.1 2
x1 = 12+8==> x1 = 10
2
x2 = 12-8==> x2 = 1
2
- 1 1 5 10
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V = { x ∈ R / - 1 < x < 1 ou 5 < x < 10 }
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Resolver a equacao 5 + |-2x+4| =11
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Verified answer
x² - 4x - 5 = 0
Δ = (-4)² - 4.1.(-5) = 16 + 20 = 36
x = 4 +/-√36 ==> x = 4+/-6
2.1 2
x1 = 4+6==> x1 = 5
2
x2 = 4-6==> x2 = - 1
2
x² - 12x + 20 ≠ 0
Δ = (-12)² - 4.1.(20) = 144 - 80 = 64
x = 12 +/-√64 ==> x = 12+/-8
2.1 2
x1 = 12+8==> x1 = 10
2
x2 = 12-8==> x2 = 1
2
- 1 1 5 10
- | + | + | + | +
- | - | + | + | +
- | - | - | + | +
- | - | - | - | +
+ - + - +
V = { x ∈ R / - 1 < x < 1 ou 5 < x < 10 }