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# Calculos do edX
import math


a = 2
b = -1
c = -4

sol_1 = -b + math.sqrt(abs(b**2 - 4*a*c))/(2*a)
sol_2 = -b - math.sqrt(abs(b**2 - 4*a*c))/(2*a)

print(sol_1)
print(sol_2)
res = 2*(sol_1**2) - sol_1 - 4
print(res)