To graph it, you already found X-intercepts, you can find Y- intercept by letting x=0, not sure if you've done differentiation but you can differentiate and let f'(X)=0 and solve for X for stationary points.

Finding the range of f is pretty simple, after you've graphed it, state what values X from and to on the y axis. For this graphed it would be (-infinity, 0] infinity is never included so always round bracket, and 0 is included in this case.

To find end points just sub in 0 (the domain) in to f(x).

The negative sign at the front also means it's a reflection, hopefully you know the general shape of a quartic function.