Respostas
Explicação passo-a-passo:
a)
x² = 0
a= 1; b = 0; c = 0
D = 0² - 4 . 1 . 0
D = 0 - 0
D = 0
x' = (-0 + 0)/(2 . 1)
x' = (0 + 0)/(2)
x' = (0)/(2)
x' = 0
x" = (-0 - 0)/(2 . 1)
x" =( 0 - 0)/( 2)
x'' = (0)/( 2)
x'' = 0
b)
-x² + 2x = 0
a= -1; b = 2; c = 0
D = 2² - 4 . -1 . 0
D = 4 - 0
D = 4
x' = (-2 + 2)/(2 . 1)
x' = (-2 + 2)/(2)
x' = (0)/(2)
x' = 0
x" = (-2 - 2)/(2 . 1)
x" =( -2 - 2)/( 2)
x'' = (-4)/( 2)
x'' = -2
c)
x² - 4x + 3 = 0
a= 1; b = -4; c = 3
D = -4² - 4 . 1 . 3
D = 16 - 12
D = 4
x' = (-(-4) + 2)/(2 . 1)
x' = (4 + 2)/(2)
x' = (6)/(2)
x' = 3
x" = (-(-4) - 2)/(2 . 1)
x" =( 4 - 2)/( 2)
x'' = (2)/( 2)
x'' = 1
d)
-x² + 4x - 3 = 0
a= -1; b = 4; c = -3
D = 4² - 4 . -1 . (-3)
D = 16 - 12
D = 4
x' = (-4 + 2)/(2 . 1)
x' = (-4 + 2)/(2)
x' = (-2)/(2)
x' = -1
x" = (-4 - 2)/(2 . 1)
x" =( -4 - 2)/( 2)
x'' = (-6)/( 2)
x'' = -3
e)
x² + 4x + 5 = 0
a= 1; b = 4; c = 5
D = 4² - 4 . 1 . 5
D = 16 - 20
D = -4