Note that, generally, f[(x+4)] is a horizontal translation of f(x) to the left by 4 units. The multiplication by 3 and -0.5 of the two terms is a vertical stretch and a shrink, respectively, except it's applied to the terms separately. But you have a cubic term in the original function which makes me wonder if something is missing in the 'transformed' function when you typed it.
You could of course expand the new function but it seems kind of pointless... or maybe I am not seeing it. I am sure other team members may have good ideas.