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4x**2-3x-5

quadratic = (-b+sqrt(b**2-4ac))/2a

quadratic = (-b-sqrt(b**2-4ac))/2a

b**2-4ac>0 --> 2 roots

b**2-4ac=0 --> 1 root

b**2-4ac<0 --> 0 roots

(-3)**2-4(4*-5)

9+80=89

2 roots = (6+89**0.5)/8, (6-89**0.5)/8

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