Question

-x+5x-6=0 -2x-10x-12=0 x+x-6=0

Answer 1

-x+5x-6=0
-x+5x=6
4x=6
x=6/4

Simplificando x=3/2
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-2x-10x-12=0
-12x=12 .(-1)
12x=-12
x=-12/12
x=-1
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x+x-6=0
2x=6
x=6/2
x=3

Ab ç .

Answer 2

- x + 5x - 6 = 0
4x - 6 = 0
4x = 6
x = 6/4
x = 3/2

- 2x - 10x - 12 = 0
- 12x = 12
x = - 1

x + x - 6 = 0
2x = 6
x = 3

Com: - x² + 5x - 6 = 0

Δ = b² - 4ac
Δ = 1 - 4. 5 . (-6)
Δ = 1 + 120 = 121

x' = 1 + 11 = 12/ - 2 = - 6
        - 2
x" = 1 - 11 = -10/ - 2 = 5
        - 2
x = - 6 e x = 5

Com
- 2x² - 10x - 12 = 0 (dividir por 2)

- x² - 5x - 6 = 0
Δ = 25 - 4 (-1) (-6)
Δ = 25 - 24
Δ = 1

x = - (-5) + 1  = 5 + 1  = - 3
         - 2            - 2

x =  - (-5) - 1 = 4   = - 2
          -2         -2

x = -3 ; x = - 2

c)
x² + x - 6 = 0

Δ = b² - 4ac = 1 - 4.1 (-6) = 25

x = - 1 +5 = 4/2 = 2
          2

x = - 1 - 5 = - 6/2 = - 3
         2

x = 2 e x = - 3