𝑉(𝑥) = 320𝑥 − 72𝑥^2 + 4𝑥^3
I really need help finding the practical domain of this polynomial function, I would really appreciate some help.
You need to specify what you mean by "practical" domain. The mathematical domain is -infinity to +infinity, so your use of "practical" suggests you have some limits on the values of V(x) (which we don't know).
+5 
