Soma e produto: determine as raízes da equação..?

COMO FAZER???? pelo amor de Deus, alguém me ajudaaaa :((

a) x² - 5x + 6 = 0

b) x² - 12 + 20 = 0

c) x² - 10x - 75 = 0

d) x² + 15x + 56 =0

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