if not isinstance(a, (int, float)) or not isinstance(b, (int, float)) or not isinstance(v, (int, float)) :
    raise TypeError("bad operand type")
x1=(-b+math.sqrt(math.pow(b,2)-4*a*c))/(2*a);
x2=(-b-math.sqrt(math.pow(b,2)-4*a*c))/(2*a);
return x1,x2;