Mim ajudem a resolver essas equações do segundo grau valendo 20 pontos.

a) x² + 6x + 8 = 0

b) x² - 10x + 9 = 0

c) x² + 8x + 16 = 0

d) x² - 6x + 9 = 0

e) x² - x - 6 = 0

f) x² - 3x + 2 = 0
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