1 - Determine, se existirem, os zeros das funções quadráticas calculando o A em cada caso:
a) f(x) = x - 3x
b) f(x) = x² + 4x + 5
c)/(x) = -x + 2x + 8
d) f(x) = x² + 10x + 25
e) f(x) = x² - 8x + 16
f)/(x) = 25x² + 9x + 1

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