Question

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Answer 1

Resposta:

a) Δ = B² - 4AC

   Δ = (-1)² - 4(1)(-20)

   Δ = 81

X= - B² ± √Δ     ÷   2A

X = 1 ± 9  ÷ 2

X' = 10 ÷ 2 = 5

X" = -8 ÷ 2 = - 4