>>> from eq_2n_grau import es_arrel_eq_2n_grau

3x²-5x+1

>>> es_arrel_eq_2n_grau(3, -5, 1, 1.434, 1e-1)
True
>>> es_arrel_eq_2n_grau(3, -5, 1, 1.434, 1e-2)
True
>>> es_arrel_eq_2n_grau(3, -5, 1, 1.434, 1e-3)
True
>>> es_arrel_eq_2n_grau(3, -5, 1, 1.434, 1e-4)
False

-x²-5x-1

>>> es_arrel_eq_2n_grau(-1,-5,-1,-4.791287,1e-3)
True
>>> es_arrel_eq_2n_grau(-1,-5,-1,-4.791287,1e-5)
True
>>> es_arrel_eq_2n_grau(-1,-5,-1,-4.791287,1e-6)
False

x²+x+0.21

>>> es_arrel_eq_2n_grau(1,1,0.21,-0.7,1e-5)
True
>>> es_arrel_eq_2n_grau(1,1,0.21,-0.7,1e-17)
False


(x-1)(x-3) = x²-4x+3

>>> a, b, c = 1, -4, 3
>>> r = es_arrel_eq_2n_grau(a, b, c, 1, 0.01)
>>> r
True