4. Identifique a, b e c e relacione a concavidade da parábola com o coeficiente a nas funções.

a) f (x) = x² - 5x + 6

b) f (x) = - 2x² + 8x - 8

c) f (x) = x² - 4

d) f (x) = - x² + x - 3​
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