Question 1177097
Is there anything that x cannot be?
It can be 0, it can be any negative number, and it can be any positive number. 
(-oo, +oo)
Look for domain restriction when there is a square root, which can't be negative or a denominator of a fraction, which can't be 0.
Here is a graph of it
{{{graph(300,300,-10,10,-50,150,-2x^3+18x^2-16x)}}}