A função f(x) = x2 − 4x + 3 é negativa no intervalo ] 1, 3 [. A função g(x) = −f(x) é positiva no intervalo A)    [ −3, −1 ].
B)    ] −3, −1 [.
C)    [1, 3].
D)    ] 1,3 [.
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