def racines(coef): a, b, c, delta = coef[0], coef[1], coef[2], b*b-4*a*c if delta<0: result = 0 else: if delta == 0: result = 1, -b/(2*a) else: result = 2, (-b-delta**0.5)/(2*a), (-b+delta**0.5)/(2*a) return result