If e-pi is transendental over Q, how can i show that

e^3 -3e^2.pi + 3e.pi^2 -pi^3 is transendental over Q.

I guess you start off by assuming e-pi is algebraic, but then i dont know how to go about it. Also if i factorise e^3 -3e^2.pi + 3e.pi^2 -pi^3 i get (e-pi)^3. Need help from here, thanks.