September 2019 1 28 Report
Dada a função f r → r definida por f(x) = x² - 5x + 6, os valores reais de x para que se tenha f(x) = 12 é:

A) -1 e 6
B) 1 e -6
C) -1 e -6
D) 1 e 6
E) -2 e 3

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