Descubra as raízes por meio da soma e do produto delas: a) x² - 5x + 6 = 0
? + ? = 5
? . ? =6

b) x² - 8x + 15 = 0

c) x² - x - 6 = 0

d) x² - 11x + 28 = 0

obs. calculos
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