def polynome_degre2(a,b,c):
    delta=b**2-4*a*c
    if delta>0:
        print("1")
        return ["Deux solutions réelles :",(-b-math.sqrt(delta))/(2*a),(-b+math.sqrt(delta))/(2*a)]
    elif b==0:
        print("2")
        return ["Une solution réelle :",-b/(2*a)]
    else:
        print("3")
        return ["Deux solutions complexes :",complex(-b/(2*a),-math.sqrt(-delta)/(2*a)),complex(-b/(2*a),math.sqrt(-delta)/(2*a))]