12. Find a third-degree polynomial with real coefficients and having zeros of 2 and 1 5i. Give your answer in expanded form.

13. Find the domain, the coordinates of any hole(s), the equation(s) of any vertical asymptote(s), horizontal asymptote(s), the x-intercept(s) (if any), and y-intercept(s) (if any) of

f(x) = (x^2 x 2) / (x^2 + x 6)