Question

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Answer 1

Resposta:

(C) 8

Explicação passo-a-passo:

x² - x - 56 = 0

a= 1; b = -1; c = -56

D = -1² - 4 . 1 . (-56)

D = 1 - 224

D = 225

x' = (-(-1) + 15)/(2 . 1)

x' = (1 + 15)/(2)

x' = (16)/(2)

x' = 8